Uncheck Use recommended performance settings, then continue to uncheck Use hardware acceleration when available. Under the General tab, scroll down and find Performance. To turn off the feature, go to Open Menu > Options. It’s a well-tried solution to this problem. Go to Open menu, select Options, head to Privacy & Security, scroll down and locate to Cookies and Site Data and History sections where you will find the corresponding clear buttons.Ĥ.

Thus, you can clean cookies, caches, and histories on your browser when encountering the problem that Firefox won't play YouTube videos. Clear cookies, caches, and histories on FirefoxĪfter you have used Firefox for a long time, the cookies and caches may get overloaded, which can cause various issues for loading a page. The button becomes grey and you have disabled it successfully.ģ. Repeat the procedure until you find the one causing the YouTube not working on Firefox issue.įollow the steps to disable an add-on on Firefox: Click Open menu > Add-ons > Extensions, click the blue button next to an extension. You can manually disable one of the add-ons, and check whether you can play YouTube videos, then disable the next add-on, and check it again. Specific add-ons would stop YouTube video playback or cause Firefox YouTube not working issues, such as YouTube full screen not working and YouTube freezing. Disable add-ons that cause the playback failure If you want to play YouTube videos under the Firefox normal mode or the method doesn’t come into it, try the following methods. A dialog pops up, hit Restart and Start in Safe Mode. To use this safe mode, click on the Open menu button at the top right corner on your browser, then select Help > Restart with Add-ons disabled. In some cases, it works for the YouTube Firefox problem. Firefox safe mode is a special Firefox mode that can be used for tackling issues caused by some extensions, hardware acceleration, and parts of other features.

Firefox 3.6.28 cant play videos