Firefox may not be the most popular browser these days, but it's still the most configurable -- right down to the smallest little pixel. If hunting through about:config is too tiring, though, free add-on Configuration Mania lets you tweak lots of options through an easy-to-browse panel.
Firefox has more hidden settings than you could count, but sometimes, you don't know what you're looking for until you know it's there. Configuration Mania makes customising Firefox a lot simpler: install the add-on, open up its settings, and you'll be greeted with hundreds of new checkboxes and options. Some of the best include:
- Disable or customise autocomplete in the address bar
- Change how Firefox displays images and animated GIFs
- Change the URL and behaviour of new tabs
- Customise how Firefox works with Windows 7's taskbar and jump lists
- Adjust how aggressive Firefox's popup blocker is
- Customise keyboard shortcuts and multi-touch gestures
...and loads more.
Best of all: If you uninstall the add-on, your configurations stay in place, so you can install it, go crazy, and then disable or uninstall the add-on. You can also reset everything back to the default from Configuration Maina's main window. Check it out at the link below.