Displays tabs in tiled layouts in Firefox. Arrange tiles horizontally, vertically or in a grid. Resize tiles by dragging splitter bars. Tabs and links can be dragged to open in other tiles. Supports multiple tiled layouts. Works with tab groups.
Adds a 'Puzzle' item to the main context menu. You can turn any image to puzzle pieces and play.
Browser Backgrounds is the new Firefox extension that lets you install backgrounds directly on your browser.
Quick lookup in Wiktionary and Wikipedia, without the need to open a new tab.
Just right-click a word while shift / ctrl / alt is pressed.