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Firefox 4x and 50 are very slow after 30 minutes. Downgrade to Firefox-Setup-33.1.1 > 43.0.1 is fast again depends not on RAM (WINXP SP3) Why so slow ?
With every update Firefox became slower. Now I have installed an old version 33.1.1. To use the saved bookmarks I had to upgrade to version 43.0.1. Now it is fast again since 2 hours I have no more problems with the performance or hang ups. The Windows task manager shows 1,364 GB Ram (250 MB one minute after starting Firefox) in use > still no problems.