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**/!\ This theme is already built-in Firefox 53 and over /!\** Enables the DevEdition theme on beta or release, and adds an entry in the Appearance's tab. Uninstalling this add-on removes the DevEdition theme from the add-on manager.
A dynamic theme that allows colouring Firefox in a Vivaldi style fashion.
This add-on provides RSS feed bookmark folders, that are auto-updated regularly, similarly to Firefox's old Livemarks. This is a mostly rewritten version of https://github.com/davidhampgonsalves/foxish
Manage your stylish userstyles right from the developer tools.
This add-on adds JS Fiddle style code prototyping to Firefox DevTools.
Adds a toggle devtools button, a responsive mode button, an eyedropper button, a scratchpad button, a browser Toolbox button, a page source button and a developer toolbar button for easy access.
A dynamic theme based on weather data from OpenWeatherMap.
A toolbar button to quickly loop a YouTube video using the YouRepeat online service.