how do i go back to the previous version?
firefox quantum hs blocky tabs, and a cluttered new tab page. additionally it seems video players are smaller than they used to be, and just a lot of the ui is an eyesore. how do i either change quantum to LOOK like the old firefox, or just get rid of quantum in general, because it isnt any faster and in some cases i find it slower.
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As to downgrading; First, Type about:preferences#advanced<enter> in the address bar. Under Advanced, Select Update.
v57+; Type about:preferences#general<enter> in the address bar. Select Update.
Check the settings.
Also turn off Use a background service to install updates
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