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CyberNet Technology News lists popular Firefox extensions with known memory leaks.

Leaky extensions include Session Saver, IE Tab 1.0.7, ForecastFox 0.8.5 and Tabbrowser Extensions. Many extensions are actively developed, so if your Firefox seems like a memory hog, make sure you have the latest versions of Adblock, AdBlock Plus, NoScript, Search Keys and Thumbs, which had memory leaks in previous versions but have been fixed.

1. IE Tab 1.0.7! Yes, it is true that one of the most convenient extensions has a memory leak. I can’t say that I am super shocked by this because how efficient can it be to run Internet Explorer in Firefox?
2. Session Saver 0.2.1.031 has a known memory leak.
3. ForecastFox 0.8.5 also has a memory leak…and that very disappointing since most Firefox users have this sitting in their toolbar (so what is the weather like by you).
4. Filterset.G Updater AND FlashGot used in conjunction will produce a memory leak.
5. FasterFox doesn’t have a memory leak specifically, but it will not help your Firefox performance. It does help your browsing performance but if you decide to keep this extension at least make sure you don’t have prefetching enabled.
6. Tabbrowser Extensions doesn’t have memory leaks either but will definitely slow Firefox down and it has many conflicts with other extension. It can even stop Firefox from being able to startup! A better alternative is Tab Mix or Tab Mix Plus which offer the same set of features. If you don’t need all the features of Tab Mix Plus then just use Tab Mix to lower the memory usage a little.

via cybernetnews.