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how to downgrade firefox to version before update
after the latest update, youtube doesn't work properly
after the latest update, youtube doesn't work properly
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選擇的解決方法
You can download previous versions at: https://support.mozilla.org/en-US/kb/install-older-version-firefox
What kind of issues do you have with the 149.0 version you have installed according to the Troubleshooting Information you supplied?
Note that 149.0.2 has been released to address some issues.