How can I install Firefox 56 version
I downloaded FF 56 version and installed it. After installation when I checked the version, it is 58. It's auto updating to 58 version everytime i install 56 version. Please help me to install 56 version
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First, Type about:preferences#advanced<enter> in the address bar. Under Advanced, Select Update.
[v56+] Type about:preferences#general<enter> in the address bar. Select Update.
Select Never Check For Updates.
Also turn off Use a background service to install updates <Windows Only>
Install Older Version Of Firefox {web link} Be sure to read everything here.
If you still want to downgrade, look under; I still want to downgrade. Click the Directory of other versions and languages link. Look for the directory of the version that you want. But, remember that old versions may have security issues.
You should also check out Firefox; Extended Support Release {web link} ESR Notes System Requirements