It is unwise to use old unsupported and insecure versions of Firefox. * (It is not recomended to) [[Install an older version of Firefox]] Facebook <br />There is a particular problem possibly with only some older XPs with facebook, that is solved in Firefox 29. FlashPlayer <br /> Flashplayer is often troublesome. But Note Windows XP will not have problems with the Adobe protected mode,it does not use that. Possibly you are running into this issue * '''Firefox is unbearably slow after updating to version 27 [/questions/985969]''' **Not really sure I can suggest a cure for that, at present but you may wish to read the thread, and add your own vote to it. **Also add feedback using https://input.mozilla.org/en-US/feedback ** And if you ensure telemetry is enabled that adds anonymised data that engineers can look at. It helps to demonstrate a real problem exists in day to day use of Firefox <br /> [[Send performance data to Mozilla to help improve Firefox]]