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Just installed FF4, and I'm trying to install adblock, but due to network policies, I cannot install it from the web site.

I've tried saving the xbi file (adblock_plus-1.3.3-fn+fx+sm+tb.xpi), and picking "Add addon from file", but I still get a message that says it's not compatible with FF4.

Is there a different file, or am I doing something wrong? Is there any way to install extenstions without network connectivity?

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Strange. Tried it on a virtual machine with a fresh FF4 installation. I downloaded the xpi file and then killed the connection on the virtual machine - FF would not let me install it. BUT - restored the connection and then it installed without any problems. Looks like FF is checking something over the connection and won't let you install without it.. – Siim K Mar 23 '11 at 14:38
@Siim: Right. The problem is I'm behind a very aggressive firewall, so it can't connect to verify. – chris Mar 23 '11 at 15:06
up vote 1 down vote accepted

Workaround to avoid the compatibility test:

  • Open about:config from the address bar
  • Right-click somewhere on the preferences list and then select New -> Boolean
  • Enter extensions.checkCompatibility.4.0 as the preference name
  • Set the boolean value to false

You should be able to install the add-ons now from file

A drawback is a nag message in the Add-ons Manager

share|improve this answer
Thank you! One other drawback is that it will re-enable all of the disabled add-ons, some of which may actually be incompatible - you'll probably want to go and disable them and test before re-enabling them. – chris Mar 23 '11 at 15:50

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