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How do I unblock a plugin that Firefox has disabled "for my protection"?

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How do I unblock a plugin that Firefox has disabled "for my protection"?

I want to use the QuickTime plugin for Firefox, but version 7.1 is blocked, and version 7.2 doesn't support Windows 2000.

I'm fine with running 7.1; the risk is very small, and I'm willing to accept it. Or does someone have another solution?

1 ACCEPTED SOLUTION

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Support Forum Moderator

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Sorry, I didn't realize that was on the blocklist.
https://bugzilla.mozilla.org/show_bug.cgi?id=430826#c59
There is a pref that can be changed in about:config to turn the blocklist off. You would also have to delete the existing blocklist.xml file in addition to turning off this preference.
extensions.blocklist.enabled

I stopped using QuickTime in 2004 or 2005 when I discovered QuickTimeAlternative - a lot slimmer installation and it doesn't "grab" all multi-media files type like QT seemed to do. I didn't have a problem with QuickTimeAlternative being blocked on Windows2000 up through last summer. That Bugzilla comment 59 mentioned that QTA 190 worked for him.
http://www.videohelp.com/tools/QuickTime_Alternative/old-versions#download

11 REPLIES
Support Forum Moderator

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Have you tired enabling that plugin?

New Contributor

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Yes. I can't do it, because the "Enable" button is grayed out.

Support Forum Moderator

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Sorry, I didn't realize that was on the blocklist.
https://bugzilla.mozilla.org/show_bug.cgi?id=430826#c59
There is a pref that can be changed in about:config to turn the blocklist off. You would also have to delete the existing blocklist.xml file in addition to turning off this preference.
extensions.blocklist.enabled

I stopped using QuickTime in 2004 or 2005 when I discovered QuickTimeAlternative - a lot slimmer installation and it doesn't "grab" all multi-media files type like QT seemed to do. I didn't have a problem with QuickTimeAlternative being blocked on Windows2000 up through last summer. That Bugzilla comment 59 mentioned that QTA 190 worked for him.
http://www.videohelp.com/tools/QuickTime_Alternative/old-versions#download

New Contributor

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Good answer! I had to track down a back version of QuickTimeAlternative that would support Win 2000, but that was easy (filehippo.com). Embedded QuickTime content now works, and as a bonus, I have full support for those ogg formats in Wikipedia, that used to be such a hassle.

Finally, it's nice to know how to disable the block list, if I ever want to do that in the future. Many thanks!

Support Forum Moderator

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

You're welcome.

New Contributor

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

I have several extensions that are now "disabled for my protection"!

None are as ubiquitous as Quicktime, but it is still annoying. I really would like to simply UNINSTALL them now--but that button is also grayed out!

I changed the status of extensions.blocklist.enabled to FALSE, but I don't know where to find blocklist.xml.

Any help would be appreciated!!

Thanks--Diane

Support Forum Moderator

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Diane,

Neither changing that pref to False or messing with the blocklist.xml file is going to help un-install those disabled extensions, all that night do is to allow those plugins to be enabled again. What you want to do is the opposite of what was being discussed in this thread - enabling plugins that were disabled by the blocklist file.

The first thing to do is to figure out which programs those plugins are associated with, and un-install those programs, if you don't want them to be used any longer. The actual "plugin" that Firefox uses is a very small part of the whole program. Beyond that you can delete the actual plugin files to get rid of them for just Firefox. I need to know which operating system you have before I can provide instructions for helping you identify where those plugins would be located on your hard drive for deletion.
For Mac OSX you will need someone elses help with that, I can't help you there. For Windows I can help you, and I might be able to help on Linux, too.

New Contributor

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

Thanks for the reply, I had had one persistent blocked extension that was a search optimizer of some sort and not associated with anything outside FireFox that I know of, but it's disappeared from the add-on list! Don't know how that happened, unless it was somehow associated with another add-on that I have uninstalled. I was tired of how slow browsing has been so I uninstalled a bunch of stuff that I only used once in a while.

I use WinXp and none of the blocked extensions appeared in my add/remove program control panel ap nor in the program files.

If you could tell me where FireFox stashes these add-ons for future ref, I'd be very happy!

Thanks again.

New Contributor

Re: How do I unblock a plugin that Firefox has disabled "for my protection"?

You should be very, very careful about simply unblocking plug-ins which are disabled for security reasons. There's more than enough evidence of a plug-in's dangers once it makes it to this point. The preferred solution is to update or remove the source of the plug-in.

That said....

If you can't find the source of a blocked add-in in the Add/Remove Programs control panel (APPWIZ.CPL), try running MSCONFIG and see if there's a startup item that looks like the same thing. Sometime startup apps can hide in HKLM\Software\Microsoft\Windows\CurrentVersion\Run (MSCONFIG will show you those). Some programs may have uninstalled in the past, but will leave behind startup services, plug-ins, or update utilities (Symantec, InstallShield are notorious for this).

More info on MSCONFIG and using it to troubleshoot issues can be found on Microsoft's online knowledge base.