color.firefox.com
Firefox Color customizes website colors, themes, dark mode, or browser appearance.
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addons.mozilla.org
Firefox Multi-Account Containers is a Firefox extension that separates users' online activities into color-coded tabs. Cookies are isolated by container, allowing use of multiple accounts on the web, and it can integrate with Mozilla VPN for an extra layer of privacy.
addons.mozilla.org
SwiftTheme is a Firefox browser extension that allows users to apply custom color themes to their browser interface. It offers more than 3 million color options, an intuitive color picker, automatic adaptation to selected colors, multiple theme variants, compatibility with older Firefox designs, and no conflicts with other browser themes. User settings are stored locally on the device and no user data is collected by the extension. A related SwiftDial homepage extension is also available from the developer.
ui.vision
ColorFish is an open-source color picker and eyedropper browser extension from Ui.Vision for selecting color values from websites and from the desktop. It is available for Chrome, Firefox and Edge, and desktop color picking requires the separate Ui.Vision XModule app.
wide-gamut.com
Wide Gamut is a tool for testing a device's color compatibility. Its home page shows detected display color support and reports browser, operating system, screen size and color depth. The page states Firefox does not support this test and recommends using an updated browser such as Safari, Brave, Chrome, Opera, Edge or Arc.
github.com
GPThemes is a Chrome and Firefox extension that modifies the ChatGPT web interface. It offers custom accent colors, adjustable chat and chatbox widths, typography controls for font family, size, line height and letter spacing, toggleable message bubbles, and light, dark and AMOLED themes. It also provides a distraction-free view that hides elements such as the header, footer and upgrade chip, an expandable prompt box, and a floating theme switcher. The extension is available for Firefox for Android and Cromite.
github.com
New Tab Override is a Firefox add-on that lets users choose which page Firefox shows whenever a new tab is opened. It can open any website, use the current homepage, display a stored local HTML file, or show a plain background color. It also offers options for focus behavior and tab position, and is available in many languages.
github.com
Anori is a customizable new tab extension for Chrome and Firefox. It lets users add and arrange widgets on the homepage, including bookmarks, calendar, notes, tasks and other tools, with widget packs organized in folders. It supports light and dark modes and offers eight color schemes and backgrounds, with users able to create their own.
github.com
A custom deployment of Mozilla's PDF.js generic viewer packaged as a Web Extension, adding a reader mode that changes PDF colors plus features such as Auto-track Document Outline, Smart Zoom text and a Show/Hide toolbar. In Firefox it replaces the built-in PDF.js viewer; in Chromium browsers it coexists with the native viewer and opens PDFs via a context menu or toolbar button.
fonts.ninja
Fonts Ninja offers a browser extension that identifies fonts on websites by hovering over text. It reports details such as font size, line height and colors, and provides typeface information including designer, pricing, additional styles and supported languages. The extension is available for free on Chrome, Safari, Firefox and Microsoft Edge.
github.com
Gruvbox Contrib is a repository of ports of the gruvbox colorscheme to other text editors and applications. It lists ports for programs including Alacritty, Emacs, Firefox, Notepad++, Qt Creator and Sublime Text. The original Vim theme is hosted in a separate repository.
prettierlichess.github.io
Prettier Lichess is a Chrome and Firefox extension that restyles lichess.org and lets users customize the site's complete color palette, with import and export of palettes. The extension is under constant development, and some page elements may not be styled correctly.
turnoffthelights.com
Turn Off the Lights is a free, open-source browser extension that applies dark mode to websites and adds a one-click dimmer for videos. The site says it uses stylesheet injection that preserves video colors while darkening the rest of the page. It lists availability for Chrome, Firefox, Edge, Safari and Opera.