Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
The easy way to download and convert Web videos from hundreds of YouTube-like sites.
This works also for audio and picture galleries.
Bypass compulsory web registration with the context menu via www.bugmenot.com.
BYM: Changes color combination ; left-click in the statusbar for changing its status (ON/OFF) or press Ctrl-Alt-B.
ER: Makes text reading easy; select the text, right-click, select the "Easy Read" entry in the context menu or press Ctrl-Alt-Z
Automatically highlight and count all occurrences of the selected text with just a click (substitute for Ctrl-F with highlight option). Another click in the document removes highlighting.
Textmarker! is a text higlighter and text copying tool for Firefox. It allows you to highlight text selections via keyboard and context menu and then highlighted text to be copied. 3 highlighter colors can be configured.
Leading dictionary lookup add-on. Fast, light, open source tool that define words for you without need to open new tabs or windows. Wiktionary&Wikipedia.
Ctrl or Shift or Alt + RightMouseButton click. Now with thesaurus.
70+ languages supported!