These are some simple Firefox 1.0 tweaks that I read about. Many are from this site.

Enable location bar display in popups in Firefox:

1. Enter about:config in the Location Bar.
2. Enter dom.disable_window_open_feature.location in the filter field.
3. Right-click (Ctrl+click on Mac OS) the preference option and choose Toggle (the value should change to true).

Fix 1.0 cache memory leak: Create a new integer browser.cache.memory.capacity and set its value to 16000 for 16MB of cache memory.

Save some memory to make un-minimize quicker: Create a new boolean config.trim_on_minimize and set its value to false.

Speeding up Firefox on Windows XP: You can speed up the loading of Firefox on Windows XP by adding it to the programs that XP prefetches. To do this, right-click the Start Menu item for Firefox, or any icon you use to start Firefox, and open the Properties dialog box. Add a space plus /Prefetch:1 to the command line and click OK. The resulting line might look as follows:

"C:\Program Files\Mozilla Firefox\firefox.exe" /Prefetch:1