How about adding this little extension with your firefox. Check it out and post your results.
FireTweaker 1.1.1 is the ultimate extension to your Mozilla Firefox browser. With more than 20 tweaks, it will make your browser act just the way you want it to.
FireTweaker 1.1.1 requires Microsoft .NET Framework 1.1.1 and a clean installation of Mozilla Firefox 0.9.x or higher to run properly. Please keep in mind that only the Official version of Firefox, which is released on Mozilla.org and available for download, is supported by Firetweaker! Any other custom compiled versions of Firefox will not be tweaked and may cause Firetweaker to crash or generate errors.
FireTweaker 1.1.1 Includes:
- Appearance: 9 Tweaks to change the Appearance of your browser. - Performance: 4 Tweaks to increase the performance of your browser, [NEW] - Including the Firefox Auto-Optimizer which will automatically optimize your page-loading and rendering performance.[NEW] - Behavior: 9 Tweaks to change the Behavior of your browser. - Webpage Appearance: 6 Tweaks to customize the way you'd like firefox to render webpages. - RollBack! 2.0: Easily rollback all applied tweaks with the click of a button! [Now Compatible with Firefox 1.0]