Avast Ad Blocker Firefox Error

I have tried to install Ad Blocker for Firefox now multiple times, reinstalled both Firefox and Avast, but it still shows this same error messages whenever I try to install it from the Avast settings:
" There was an error while installing the plugin ".

I know that I can manually drag the plugin from Avast folders to Firefox, but I would like to get this issue resolved.
Security Plugin is installs fine on Firefox. And both plugins work well on Chrome and IE.

Do you already have AdBlockPlus firefox add-on installed ?
If so the avast Ad Blocker is based on this add-on so won’t install.

Nope, I don’t have that, and I have never had it.

Firefox 21.0 has some measures when installing 3rd party add-ons (those not installed from the Mozilla site), so it may be blocking it.

Is it listed in the firefox add-ons page and if so is it shown as enabled/active ?

It’s not listed unless I manually add it from Avast folders, but It would be more nice just to install/uninstall from Avast itself and not from Firefox.

That is the way it is meant to work and has worked for me or several versions of avast and firefox. The only change is as I have said is the 3rd party add-on policy in firefox, which may initially ask permission to install it.

If you missed this dialogue window then it may not have been installed correctly or at all.

I know that I can manually drag the plugin from Avast folders to Firefox, but I would like to get this issue resolved.

The problem is that FF21 changed the location where it looks for its plug-ins. Avast is still “installing” it in the older location, that was used by FF20 (and earlier). Unless/until either FF is re-programed to look at the earlier location, or avast is re-programed to place the file in the newer location that FF now requires, the only “fix” available to users is to manually drag or copy the plug-in:

Close Firefox. Navigate to your

C:\Program Files\Mozilla Firefox\extensions

folder, locate the adblocker@avast.com.xpi file, and move (or copy) it to your

C:\Program Files\Mozilla Firefox[b]browser[/b]\extensions

folder. Open Firefox, and allow it permission to install the add-on.

Note: On an x64-bit system, specify Program Files b[/b] [rather than simply Program Files ] when navigating to the sub-directories.

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Perhaps “inelegant”, but it works. As for FF or Avast implementing the change properly, all we can hope is that one of these will “blink” when they set-up a newer program build.

But I don’t understand why Security Plugin installs fine and Ad Blocker won’t. Why won’t Avast fix this issue if it has been problem for several versions?

I don’t have any extensions folder.

Neither can I, that is what I mean it should be in the same location for extensions. I don’t use the avast Ad Blocker as I have AdBlockPlus, but if the WebRep can be installed in firefox, the same should be correct for Ad Blocker.

If you don’t have the C:\Program Files\Mozilla Firefox\extensions folder or the C:\Program Files\Mozilla Firefox\browser\extensions then any add-on is likely to fail.

That said I have 27 add-ons but can’t see any of them in either location.

You should find your other Firefox extensions stored under

[b]C:\Users[/b]your user profile name[b]\AppData\Roaming\Mozilla\Firefox\Profiles[/b]some random numbers.default\extensions