Firefox has a long history of being one of the slower internet browsers around. I mean, most of us has a general impression that Firefox boots slow (particularly from a cold start), and after start becomes “laggy” when you open too many tabs or use it for extended periods of time without a reboot. Sounds familiar right? But on the other hand we also know that Mozilla has made substantial optimizations to speedup and optimize the memory usage in recently released Firefox 4.0. However, one thing that even Firefox 4.0 cannot fix is the general slowdown and increase in memory usage coming from a long list installed extensions. This is particularly true for the Firefox power users that have installed many extension to customize different aspects of the browser. Now considering the scenario of the slowdown coming from the installation of the extension, you might be interested know the culprit extensions that are the biggest contributors to these slowdowns particularly at the startup.
Mozilla has done a nice job compiling a list of Firefox extensions that are THE biggest contributors to the Firefox startup slowdown. Interestingly some well known extensions are also included in this list such as Firebug, FlashGot and Video DownloadHelper. Have a look for yourself:

Head to the Mozilla website for the complete top 50 list.
Also, don’t forget this ‘Hackiest’ Hack ever to speedup Firefox that we reported earlier!
[Source]
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