A couple of days ago, I talked about Adblock and posted a screenshot of my good friend Quant's Firefox memory usage.

It seems like this uber leakage of 600MB of memory came from Adblock.

This page contains a list of some extensions which are known to be leaky. They include:

• IE Tab 1.0.7
• Session Saver 0.2.1.031
• ForecastFox 0.8.5
• Filterset.G Updater and FlashGot when used together
• Older versions of some extensions including Adblock, Adblock Plus and NoScript. Click on "Find Updates" in Tools > Extensions.

Firefox 1.5.0.1 also fixes several memory leaks from version 1.5.0 so make sure you upgrade.