You might have noticed that Firefox performs poorly when you surf for a long time or open lots of tabs at once. Many wrongly believe that this is due to some memory leak caused by extensions (even, I used to believe this). This is actually caused because Firefox stores 50 most recently visited websites in a memory session inorder to speed up the pageload of the previously visited site.
Average web surfer tend to visit only 3 – 5 websites out of the previously visited websites, so you can reduce the resource hog by changing the memory threshold to 5 (or anything below 50). This can be done by typing ‘about:config’ in your Firefox address bar and search for ‘browser.sessionhistory.max_entries’ (without quotes), right click on that entry and choose modify. Now set the value for 5 (or anything lower than 50).
I first read this trick on Ghack and then I tried it myself. It made my Firefox work smoothly for longer.
Via Jayaprakash
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