This is where I collect Firefox tips and tricks.
- To remove a URL from the list of suggestions that appears underneath the address bar: SHIFT-BACKSPACE (Mac) or del (Win)
- To enable spellchecking on input boxes: type about:config in the address bar, set layout.spellcheckDefault to 2
- To reopen a tab accidentally closed: SHIFT-cmd-T
- To remove a single site from history: CMD-SHIFT-Hm then right click on any page from the site
- In the address bar, show a list of URLs with a given tag type the tag followed by +
- To stop selecting the whole address bar when clicking once: about:config, then double click browser.urlbar.clickSelectsAll and set it false

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