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Before refresh I had adblock now it is missing, how to install?

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Why the Adblock I had in the firefox vanished after I hit refresh button - as firefox was crashing...slow...

Why the Adblock I had in the firefox vanished after I hit refresh button - as firefox was crashing...slow...

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Adblock Plus is available from the Add-ons site:

https://addons.mozilla.org/firefox/addon/adblock-plus/

If you were using a different one, you can search there for other options.

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Refresh Firefox {web link} is a LAST RESORT ! !

Refresh Firefox - reset add-ons and settings

If you're having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.