Easiest way to Add and Manage Custom User Styles in Firefox.
Add, Edit, enable, disable and delete in-numerous User Style Sheets to redesign the Firefox and the Web.
Offers the possibility to display documents in browser window.
Add "Go Parent Folder" menu to context menu in The Library list view and Search result in Bookmarks Sidebar.
Install Browser Extensions straight from GitHub Repositories
A suite of tools for developers.
Adds extension options dialogs to the Tools or Titlebar menu and includes toolbar icon.
Suspends background old tabs automatically to save memory usage.
You can choose items displayed in the sidebar.
This extension did not work in MacOS X.
Markdown document viewer.
Allows to visualize formatted markdown documents in browser.