Privacy Browser">

Soren
Stoutner
"> soren@stoutner.com">

]>

# The &privacybrowser; Handbook

&Soren.Stoutner; &Soren.Stoutner.mail;
2016-2017, 2021-2026
&Soren.Stoutner;
&FDLNotice;
2026-04-25
&privacybrowser; version 0.9

&privacybrowser; is a web browser that respects your privacy.

The only way to prevent data from being abused is to prevent it from being collected in the first place.

KDE
privacy
browser

## Introduction

&privacybrowser; is currently in an early alpha state. Most of the features are not yet implemented, but I thought it would be useful to publish it so that users can track the progress and submit feedback.

To distinguish between the Android and the PC version, the website, issue tracker, and code base refer to this version as Privacy Browser PC.

The best place to discuss the development of Privacy Browser is on the forum. I also frequently post on my Mastodon account regarding the development status.

### Qt WebEngine

Privacy Browser uses Qt WebEngine to render websites. Qt WebEngine is based on the Chromium Blink source code. Qt maintains a list of the Chromium versions which each Qt release is based on.

### Bugs and Missing Features

There is a list of feature requests and known bugs at redmine.stoutner.com. Users should anticipate that all the current features of Privacy Browser Android will also be implemented in Privacy Browser PC. There is no need at this point to create features requests for these as they will be added as I start working on each feature and have a better idea of how they will be implemented. However, each feature that has already been implemented should be bug free. If you discover a bug that is not already documented at redmine.stoutner.com please add it.

Below is a list of known prominent bugs or missing features in this alpha release.

- The page zoom is momentarily reset every time a new URL is loaded.

- Browser error messages are not displayed unless JavaScript is enabled.

## Using &privacybrowser;

Screenshot

### JavaScript

JavaScript allows web pages to run scripts (programs) on your device. It allows web pages to function more like apps, but it also allows web pages to spy on you. Most of the tracking on the internet does not work when JavaScript is disabled. JavaScript can be toggled by clicking on the privacy shield, which is blue if JavaScript is disabled and red when it is enabled. JavaScript

### Local Storage

Local storage in Privacy Browser encompasses cookies, DOM storage, IndexedDB, service workers, and the filesystem API. Local storage can be toggled through an action on the toolbar.

#### Cookies

Cookies allow websites to store small pieces of information for a specific host that are sent in the HTTP header every time the browser connects to that host. Privacy Browser allows a maximum of 180 cookies with a maximum size of 4096 bytes per cookie to be set per domain. Cookies are often used to track users across the web, particularly third-party cookies (which are completely blocked in Privacy Browser). They are also used as a security mechanism on websites where you log in to identify it is you as you browse from page to page on a site.

Cookies

The cookies dialog is opened from . Durable cookies are shared with all tabs that are opened after they are made durable and are preserved even when Privacy Browser is restarted. This allows users to stay logged in to sites of their choosing. No cookies are durable by default. Making a cookie durable requires specific user interaction.

All other cookies are specific to the tab where they are created and are destroyed when the tab is closed.

#### DOM storage

DOM (Document Object Model) storage, also knows as web storage, allows web pages to store information on a client device. The storage capacity is larger than for cookies and the data is not automatically sent in the headers with every HTTP request. In Privacy Browser, each website is allowed to store a 5 MB of data in DOM storage. DOM storage requires JavaScript to function, and, in addition, requires an extra toggle to be enabled. In Privacy Browser, DOM storage is limited to the tab where it is created and is destroyed when the tab is closed.

#### IndexedDB

IndexedDB provides web pages with a local database where they can store “significant amounts of structured data”. There is disagreement on the internet about the maximum size of an IndexedDB database, probably because the various rendering engines keep changing their mind. But it is usually listed at somewhere between 20% and 80% of your entire hard drive with each individual domain limited to some segment of that. IndexedDB requires JavaScript to function. In Privacy Browser, this database is limited to the tab where it is created and is destroyed when the tab is closed.

#### Service Workers

Service workers are offline JavaScript proxies of a website. They have their own cache that is usually hidden and hard to clear. They were designed by people who want the web browser to become the operating system and run full “apps”. In Privacy Browser, service workers are limited to the tab where they are created and are destroyed when the tab is closed.

#### Filesystem API

The filesystem API grants the browser direct access to the files on your system. Like service workers, the filesystem API is a summarily bad idea thought up by those who want the browser to become an operating system. Even when JavaScript and local storage are enabled, the filesystem API does not work in Privacy Browser.

### User Agent

The user agent is a text string that is sent as part of every HTTP header that identifies the browser to the web server. Privacy Browser's default user agent is `PrivacyBrowser/1.0`. Qt WebEngine 5.15.15’s default user agent is `Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.15.15 Chrome/87.0.4280.144 Safari/537.36`.

Over the years user agents have become quite lengthy, partially because they tend to include a brief history of the internet. In the modern world they serve almost no good purpose, but some web developers still think they need them so they can send different version of their website to different browsers. Some servers refuse to function correctly if they don't like the user agent that is sent.

At some point in the future Privacy Browser will send no user agent by default. Not only is that currently impossible because the Qt WebEngine doesn't allow you to not send a user agent (I will probably have to fork it to enable that functionality), but even web servers that don't care what the user agent is often refuse to send an answer if there is no user agent at all. Getting rid of this relic of the internet is going to take some time and a retraining of common expectations.

### Domain Settings

Domain setting make it easy to automatically change JavaScript, local storage, user agent, and other settings when the domain changes. Domain settings for the current domain can be accessed through the domain settings button at the far right of the URL line edit. Domain settings for all domains can be accessed through . When domain settings are active, the URL line edit will have a green background.

### HTTP Pings

HTTP hyperlinks can have an extra ping attribute that sends a POST request to a different URL. These HTTP pings are commonly used for tracking. Most browsers send HTTP pings without informing the user in any way (despite what The Register article says, current versions of FireFox also happily send HTTP pings).

Privacy Browser blocks all HTTP pings and presents a dialog informing the user every time the current tab attempts to send one. Hopefully, as more people become aware of what HTTP pings are, web sites will become more embarrassed about using them. This is a classic example of how those who wrote the HTTP specs do not have the best interests of internet users at heart. I would like the day to come when this is removed from both the internet and the spec. Here is an example of me raising the issue with F-Droid.

### Spell Checking

Privacy Browser uses the binary `.bdic` Hunspell dictionary format utilized by Qt WebEngine which was created by Google for Chromium. Debian’s Hunspell dictionary language packages are slowly adding support for the `.bdic` format. Those which have are listed by Privacy Browser as suggested packages.

Once a `.bdic` dictionary is installed, it can be enabled in Privacy Browser’s settings.

## Command Reference

### Main Window

#### File

&Ctrl;T File New Tab

  Create a new tab.

&Ctrl;N File New Window

  Create a new window.

&Ctrl;A File Save Archive

  Save the webpage as an MHT (MIME encapsulation of aggregate HTML documents) archive.

&Ctrl;P File Print

  Print the document.

&Ctrl;&Shift;P File Print Preview

  Display the print preview dialog.

&Alt;F File Open with Firefox

  Open the current URL in Firefox. This entry only displays if Firefox is installed.

&Alt;C File Open with Chromium

  Open the current URL in Chromium. This entry only displays if Chromium is installed.

&Ctrl;Q File Quit

  Quit &privacybrowser;.

#### Edit

&Ctrl;F Edit Find

  Display the find toolbar and focus the find text line edit. If the toolbar is already displayed, the find text line edit is refocused and the text it contains is selected.

F3 Edit Find Next

  Find the next entry on the page that matches the specified text. This action is only displayed if the find toolbar is visible.

&Shift;F3 Edit Find Previous

  Find the previous entry on the page that matches the specified text. This action is only displayed if the find toolbar is visible.

#### View

&Ctrl;0 View Zoom Default

  Return to either the app or the domain default zoom factor.

&Ctrl;+ View Zoom In

  Increment the zoom factor by 0.25. Valid factors range from 0.25 to 5.00.

&Ctrl;- View Zoom Out

  Decrement the zoom factor by 0.25. Valid factors range from 0.25 to 5.00.

F5 View Refresh

  Reload the website in the current tab. When Refresh is visible, is hidden.

&Ctrl;F5 View Reload and Bypass Cache

  Reload the website in the current tab bypassing any information in the cache and loading everything from the webserver.

&Ctrl;&Shift;X View Stop

  Stop the loading of the website in the current tab. When Stop is visible, is hidden.

&Ctrl;U View View Source

  Toggle between viewing the source and viewing the rendered website.

&Ctrl;&Shift;U View View Source in New Tab>

  Open a new tab displaying the source of the current tab, or a new tab displaying the rendered version if the source is already displayed. Note that right-clicking on the background of a rendered website will display a context menu with a "View page source" entry, which performs the first of these actions.

F12 View Developer Tools

  Display the developer tools, which are used to debug websites.

&Ctrl;&Shift;F View Full Screen Mode

  Toggle full screen mode. This performs the same action as .

#### Go

&Alt;Left Go Back

  Navigate back one step in the current tab’s history. The action is disabled if it is not possible to go back.

&Alt;Right Go Forward

  Navigate forward one step in the current tab’s history. The action is disabled if it is not possible to go forward.

&Alt;Home Go Home

  Load the home page in the current tab.

#### On-The-Fly Settings

&Ctrl;J On-The-Fly Settings JavaScript

  Toggle JavaScript in the current tab.

&Ctrl;L On-The-Fly Settings Local Storage

  Toggle local storage in the current tab.

&Ctrl;D On-The-Fly Settings DOM Storage

  Toggle DOM storage in the current tab.

##### User Agent

&Ctrl;&Alt;P On-The-Fly Settings User Agent Privacy Browser

  Use the Privacy Browser user agent for the current tab.

&Ctrl;&Alt;W On-The-Fly Settings User Agent WebEngine Default

  Use the WebEngine Default user agent for the current tab.

&Ctrl;&Alt;F On-The-Fly Settings User Agent Firefox on Linux

  Use the Firefox on Linux user agent for the current tab.

&Ctrl;&Alt;C On-The-Fly Settings User Agent Chromium on Linux

  Use the Chromium on Linux user agent for the current tab.

&Ctrl;&Alt;&Shift;F On-The-Fly Settings User Agent Firefox on Windows

  Use the Firefox on Windows user agent for the current tab.

&Ctrl;&Alt;&Shift;C On-The-Fly Settings User Agent Chrome on Windows

  Use the Chrome on Windows user agent for the current tab.

&Ctrl;&Alt;E On-The-Fly Settings User Agent Edge on Windows

  Use the Edge on Windows user agent for the current tab.

&Ctrl;&Alt;S On-The-Fly Settings User Agent Safari on macOS

  Use the Safari on macOS user agent for the current tab.

&Alt;&Shift;C On-The-Fly Settings User Agent Custom

  Use the custom user agent for the current tab. This action is only active if a custom user agent is set in the settings.

##### Zoom

&Ctrl;&Alt;Z On-The-Fly Settings Zoom Factor

  Display the zoom factor dialog.

##### Search Engine

&Ctrl;&Shift;M On-The-Fly Settings Search Engine Mojeek

  Use Mojeek as the search engine.

&Ctrl;&Shift;O On-The-Fly Settings Search Engine Monocles

  Use Mojeek as the search engine.

&Ctrl;&Shift;E On-The-Fly Settings Search Engine MetaGer

  Use MetaGer as the search engine.

&Ctrl;&Shift;G On-The-Fly Settings Search Engine Google

  Use Google as the search engine.

&Ctrl;&Shift;B On-The-Fly Settings Search Engine Bing

  Use Bing as the search engine.

&Ctrl;&Shift;Y On-The-Fly Settings Search Engine Yahoo

  Use Yahoo as the search engine.

&Ctrl;&Shift;C On-The-Fly Settings Search Engine Custom

  Use the custom search engine. This action is only active if a custom search engine is set in the settings.

#### Filter Lists

&Ctrl;R Filter Lists Requests

  Open the requests dialog.

&Ctrl;&Shift;L Filter Lists View Filter Lists

  View the filter lists dialog.

#### Bookmarks

&Ctrl;&Alt;&Shift;B Bookmarks Edit Bookamrks

  Open the bookmark editing dialog.

&Ctrl;&Alt;B Bookmarks View Bookmarks Toolbar

  Toggle the visibility of the bookmarks toolbar.

&Ctrl;B Bookmarks Add Bookmark

  Add a new bookmark.

&Meta;F Bookmarks Add Folder

  Add a bookmark folder. The meta key on most keyboards is the Windows key.

#### Settings

&Ctrl;&Shift;D Settings Domain Settings

  Display the domain settings dialog.

&Ctrl;; Settings Cookies

  Display the cookies dialog.

#### Common Settings and Help Entries

&privacybrowser; has many common &kde; Settings and Help menu items. For more information read the sections about the Settings Menu and Help Menu.

#### Other Commands

`&Ctrl;+S`

  Toggle find case sensitive if the find toolbar is visible.

`&Ctrl;+&Shift;+Click`

  Open link in new tab. This performs the same action as right-clicking on the link and selecting “Open link in new tab”.

`&Ctrl;+Click`

  Open link in new background tab. This performs the same action as right-clicking on the link and selecting “Open link in new background tab”.

`&Shift;+Click`

  Open link in new window. This performs the same action as right-clicking on the link and selecting “Open link in new window”.

`&Alt;+Click`

  Save link. This performs the same action as right-clicking on the link and selecting “Save link”.

`F11`

  Toggle full screen mode. This performs the same action as .

`&Ctrl;+&Shift;+R`

  Restore the URL text (if it has been edited) to the URL that is currently displayed in the tab.

`&Esc;`

  Escape runs the first command that applies from the following list.

  - Exit full screen browsing.

  - Clear the find text line edit and the find text highlights.

  - Hide the find text toolbar.

### Cookies Dialog

The cookies dialog is accessed through (see ).

#### Commands

`A`

  Open the add cookie dialog.

`E`

  Open the edit cookie dialog. This command is only valid if a cookie is currently selected.

`D or &Del;`

  Delete the currently selected cookies. A dialog will confirm the deletion before it is processed.

`L`

  Delete all the cookies. A dialog will confirm the deletion before it is processed.

`C or &Ctrl;Q`

  Close the cookies dialog.

### Save Dialog

The save dialog pops up when a download is initiated.

#### Commands

`S`

  Save the file.

`C or &Ctrl;Q`

  Close the save dialog without saving the file.

## Changelog

### 0.9 - 25 April 2026

- Enable JavaScript copying to the clipboard with user interaction.

- Fix populating the URL for slowly loading websites when the tab is switch while they are loading.

- Don’t expand the bookmarks folders when opening the bookmarks dialog.

- Preserve the scroll position when moving a bookmark in the bookmarks dialog.

- Disable URL syntax highlighting when no protocol is specified.

- Open new tabs adjacent to the current tab.

- Make the text in the requests dialog non-editable.

- Widen the domain settings dialog to prevent the need for horizontal scrolling on some screens.

- Separate filter list applied entries with four spaces instead of an asterisk.

- Fix "generichide" creating incorrect allow filters.

- Add WebSocket support to the filter lists.

- Block all prefetch, preload, and CSP requests.

- Improve the padding around the blocked requests tracker.

- Fix the request color highlighting for allow lists.

- Fix the initial size of the developer console to be the bottom half of the screen.

- Display the zoom factor correctly when changed by CTRL-Scrolling.

- Clarify that Fanboy's Annoyance Lists’s license is just Creative Commons Attribution 3.0 Unported.

### 0.8 - 30 January 2025

- Fix the WebEngine reloading the current URL when trying to load a new URL with a different user agent. This also fixes three related bugs.

- Disable opening of links with an `_blank` target in a new tab, which also resolved two other bugs.

- Disable the web cache.

- Fix the background color of highlighted combo boxes in Domain Settings.

- Hardcode the dictionary path if the environment variable is not set.

### 0.7 - 11 December 2024

- Migrate to KDE 6.

- Colorize the requests counter background.

- Restore the current URL text when switching tabs.

- Update the zoom icons.

- Adjust some of the default dialog sizes to be smaller.

- Update the domains database in all windows when it changes.

- Add an option to delete all domains settings at once.

### 0.6.2 - 30 September 2024

- Fix a PIE/PIC crash in the Ubuntu packages (hopefully).

- Add entries to open in other browsers to the window and context menus.

- Make the Requests Detail dialog scrollable.

### 0.6.1 - 21 August 2024

- Fix the domain settings dialog not fitting on small screens.

- Apply domain settings even when the main URL is explicitly allowed by the filter lists.

### 0.6 - 15 July 2024

- Add filter lists.

- Add URL syntax highlighting.

- Add a DevTools interface.

- Implement opening and saving of MHT web archives.

- Handle HTTP authentication.

- Remember the download directory.

- Update bookmarks in all windows when modified.

- Display Unicode URLs in Punycode.

- Multiple small improvements to the code and the user experience.

### 0.5 - 12 October 2023

- Add bookmarks.

- Add zoom controls to the status bar and a default zoom shortcut.

- Add keyboard shortcuts for the URL toolbar actions.

- Add an action to view page source.

- Change the domain settings combo boxes to list `enabled` above `disabled`.

- File downloads can now show the size before the download begins.

- Add PIE (Position Independent Executable) compiler flags.

- Fix a bug that sometimes allowed multiple domain settings to be created.

- Fix the download notification not being cleared on Xfce.

### 0.4 - 13 June 2023

- Add a setting to control spatial navigation.

- Add an action to reload and bypass cache.

- Fix a crash if one Privacy Browser window is closed while a tab within it is loading.

- Add keyboard+click commands to the Handbook.

### 0.3 - 8 May 2023

- Add the changelog to the Handbook.

- Add the missing current domain settings icon on Gnome and Xfce.

- Make changes to build on Guix.

### 0.2 - 17 April 2023

- Fix a crash on GNOME when downloading a file with local storage disabled.

- Fix problems with missing icons on GNOME.

- Display an animated favorite icon while a webpage is loading.

- Fix the Handbook on non-KDE systems.

- Change the order of entries in the WebEngine context menu.

- Make spellcheck languages easier to click on.

- Only generate a HTTP ping dialog if the request is made by the current tab.

- Add a section to the Handbook about HTTP pings.

### 0.1 - 11 March 2023

- Initial release.

## Questions and Answers

Why are there no questions?

Because Privacy Browser is so perfectly designed that none have ever been asked. Also, because this is an alpha release and nobody has had a chance to ask them yet. ;)

## Credits and License

Privacy Browser PC copyright 2016-2017, 2021-2025 Soren Stoutner soren@stoutner.com.

### Program

The source code is available at gitweb.stoutner.com or by running `git clone https://git.stoutner.com/PrivacyBrowserPC.git`.

Translators:

- Translations will be added in a future release.

&underGPL;

### Filter Lists

UltraPrivacy and UltraList are developed by Stoutner. They are released under the GPLv3+.

EasyList and EasyPrivacy are dual licensed under the GPLv3+ or the Creative Commons Attribution-ShareAlike 3.0+ Unported licenses. Privacy Browser incorporates them using the GPLv3+ option.

Fanboy’s Annoyance List is released under the Creative Commons Attribution 3.0 Unported license, which is compatible with the GPLv3+. This list is included unchanged in Privacy Browser.

More information about the filter lists can be found on the EasyList website.

### Documentation

`doc/index.docbook` and `src/com.stoutner.privacybrowser.appdata.xml` are released under the GFDL-1.3 license with no Front-Cover or Back-Cover Texts or Invariant Sections. All other documentation is released under the GPLv3+ license.

&underFDL;

### Icons

Privacy Browser

JavaScript

Privacy Browser Monochrome

are derived from `security` and `language`, which are part of the Android Material icon set and are released under the Apache License 2.0. Modifications copyright 2016-2017,2021-2023 Soren Stoutner. The resulting images are released under the GPLv3+ license.

Loading

comes from FlutterLoadingGIFs where it is named `cupertino_activity_indicator_selective.gif`. It is released under the Zero-Clause BSD License.