The coolest thing about the [[w:Firefox]] browser is its modularity. I’m not going to blog extensions which are high in the most popular list, but if I come across genuinely useful ones which do not have as much mindshare, I’ll report it here.

Firefox custom keywords are a very neat feature to access many different search engines from the location bar. (The only drawback as compared to the search box is that they do not have an autocomplete history.) If you already use them or intend to do so, you will find the SmartSearch extension useful. It makes all your custom keywords available through the context menu.

SubmitToTab allows you to post forms to a new tab by middle- or right-clicking the submit button. This feature should definitely be part of Firefox by default. It can be essential when dealing with security sensitive forms where you might lose form data when going from one step to the next.

Refcontrol gives you full control over what referers Firefox sends when you click a link, on a per-site basis. Its UI is a bit unconventional, but it does the job. (I need this now because WordPress requires referers to work properly!)

Finally, UndoCloseTab, which you have to install from the developer’s site, allows you to restore tabs you accidentally closed by right-clicking the tab bar. It does not remember the form data, however.

Got browser ideas? [[edit:Browser|Add them to the wiki]]!