Flash videos (like YouTube) reload automatically when opened
Videos played in Firefox, particularly flash videos like on YouTube, always reload automatically when I focus on them. For example, I open a video in a new tab to let it pre-load or begin to play it, then when I click on the tab to watch the video it will reload, defeating the point of the pre-load buffer. This happens on all flash video websites and is particularly annoying when multiple windows are buffering.
URL of affected sites
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")