An open security extension for browsers that starts from a conservative trust level for unclassified sites and lets the user decide which ones may run scripts. Permissions can be set per site, and the same component ships inside the Tor Browser. Version 13.6.36.

An open source browser project maintained mainly by Google, with core code under a permissive licence and test oriented builds published alongside release channels. Design documents, architecture notes and test material sit next to the source, across Windows, macOS and Linux.

Waterfox is a cross-platform browser on the Gecko engine with built-in content filtering and vertical tree tabs, and tabs that can be unloaded by hand. Version 6.7.4 brought RSS and live bookmarks back, and 6.7.5 added a subscription manager.

Min treats the browser as something to be reduced rather than expanded: one address bar for search, navigation and quick arithmetic, tabs that fade when idle, and a focus mode that clears the screen. Open source, light on memory, three desktop platforms.

The browser arms race keeps eating memory, and not everyone needs the heavy equipment. Falkon starts quickly, loads pages responsively and stays restrained on memory, while still shipping blocking rules, vertical tabs and a feed reader.

The mouse is the default accessory of a browser, and for people who live on the keyboard, reaching for it is itself an interruption. qutebrowser turns navigation into typed commands: press a key, every link gets a label, type the label.

Ungoogled Chromium patches the Chromium source at build time, replacing company domains with invalid ones and blocking internal requests, and publishes every change as a readable patch.

Pale Moon is an independently maintained browser with its own Goanna engine, no telemetry and a surviving XUL extension system that lets add-ons reshape the interface.

An old name in the KDE line that still does two jobs at once: pages rendered by a modern engine, and a file manager that borrows most of the desktop's abilities, including a working client for remote directories that behaves like a local folder.

Thorium keeps the Chromium engine but changes how it is compiled, ships per instruction set, and turns on parallel downloads, full addresses and privacy defaults.

An open source browser framework built on a common rendering engine, in which the behaviour of the browser is assembled from scripts. Keys, tabs, blocking and proxies are modules chosen in a configuration file, and a few edited lines change how the whole thing works. Very small, quick to start, and aimed at Linux and BSD.

An open-source browser that filters advertising inside its own core instead of relying on extensions. Tracking and fingerprinting countermeasures are tightened on a fresh install, and the address bar will list the requests and scripts behind the page in front of you. It runs on Android, Windows and Linux under a GPL licence.

An independent browser engine built from scratch rather than forked: its own HTML parser, CSS layout, JavaScript runtime and renderer, funded by a non-profit that takes no search deal, runs no ads and collects no data.

Basilisk runs on an independently maintained XUL platform and its own engine, keeps XUL and overlay extensions alive, and still follows modern standards and security fixes.

A browser run by a non-profit foundation, with tracking protection on by default, container tabs that separate identities, encrypted sync the operator cannot read, a built-in PDF editor and thirty thousand extensions. Open source, on five platforms.