I always use the Firefox Nightly build as I have mentioned in the past in order to stay abreast of the latest developments. If you use the Firefox Nightly too like me, you may have noticed that YouTube videos no longer work after the latest update to the Nightly branch. Also Google Drive does not work correctly. Additionally, some Russian sites stopped working properly for me, mostly those that use modern client-side JavaScript libraries. If you faced this issue, here's how to fix it.
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