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I find that I cannot watch a YouTube video on my MacBook in Firefox for more than 10 seconds without the fans coming on at full throttle. This is one of the fe

I find that I cannot watch a YouTube video on my MacBook in Firefox for more than 10 seconds without the fans coming on at full throttle. This is one of the few reasons that I start up chrome, as strangely I can watch the same video in chrome without performance issues. I haven't had this issue on Firefox on PC

colanderman 8y ago
Disable "Automatic graphics switching" in "Energy Saver" in OS X settings. This fixed this problem for me (which started about 4 months ago). (I'm on Yosemite.)
- fernly 8y ago
  I'm on Yosemite and I don't see anything like that in the energy saver preference pane.
  - joethebro 8y ago
    That setting will only appear if you have a 15" with a dedicated GPU. 13" only have "Energy Saving" integrated graphics and don't need the setting
hrktb 8y ago
Google properties are a lost battle. Google Sheets and Google Docs have been horrible on anything than Chrome for a while as well, and I guess they have no incentive to make that situation change. Firefox is dealing with it better than before I think, but I won’t hold my breath for parity to ever come.
scns 8y ago
Try the h264ify extension, it forces h264 video instead of webm, you can block 60fps videos too if you want to halve the size of the download. If your cpu does not have a webm decoder in hardware, it has to decode them in software which is inefficient.