When I try to add on and add-on I get the following message..."(add-on name) could not be installed because FireFox could not modify the needed file"; What is wrong?

Third party cookies are allowed; I click install when I get a message about an untrusted author;

That probably means that the extension lacks the required <nowiki><em:unpack>true</em:unpack></nowiki> line in the file install.rdf to make sure that the file gets unpacked after installing.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
Firefox 4 and later no longer unpacks an extension automatically, but renames the XPI file to the ID of the extension and copies that file to the extensions folder in the Firefox Profile Folder.
Try to set the Boolean pref extensions.alwaysUnpack to true on the about:config page.
*http://kb.mozillazine.org/about:config

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I am trying to download a new theme. Lava theme. However, it will not let me download that or any other theme for that matter.
It continues to say, So and so could not be installed because Firefox does not have the needed files. What does this mean?
Also, on the newer version.. I can not find the tools option..

The Firefox versions which come with many Linux distros have the default Mozilla Firefox updater disabled and use the distros built-in updater.
See this - http://linuxforums.org.uk/netbooks/install-firefox-6-on-an-acer-aspire-one-running-linpus-lite-linux/

Why can't I download the add-on for tv-fox I got the following when I tried: TV-Fox could not be installed because it is not compatible with Firefox 6.0.2

I installed FireFox so I could take advantage of the TV-Fox add-on which is supposed to provide free television, so I can cancel my cable. But, as stated above, I got the following when I tried:
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Duplicate. An answer has been posted here --> https://support.mozilla.com/en-US/questions/879520
Moderator: Please LOCK '''''this''''' thread.

HT1338 When I try to start my Garageband 6.05 I get a repetitive message that the core audio midi will not start. If I choose to ignore it, report it or reopen it, it just keeps coming up and garage will not load or start up? Any suggestions? THanks

When I try to start my Garageband 6.05,I get a repetitive message that the core audio midi will not start. If I choose to ignore it, report it or reopen it, it just keeps coming up and garage will not load or start up? Any suggestions? THanks

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[Add-on] could not be installed because firefox cannot modify the needed file

I've tried both Zotero & Firefox forums with no success:
Zotero could not be installed because Firefox cannot modify the needed file.
I've deleted my cache, restarted firefox and computer, tried in various versions of Firefox (currently 8.0 which the add-on store says is compatible). I'm running brand new Mac with Windows for Mac 2011, have tried downloading in Safari & dropping into Firefox, from the Firefox add-ons and directly from the site. The add-ons says - unable to install & both the other methods list the above error (cannot modify the needed file).
Thanks in advance.

This can be a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (extensions.sqlite, extensions.ini, extensions.cache, extensions.rdf) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry. 
New files will be created when required.
See "Corrupt extension files":
* http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
* Help > Troubleshooting Information > Profile Directory: Open Containing Folder
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is an update.

HT202157 When I try to update my Apple TV software, I get an error message "update was unsuccessful try again later". I've tried downloading the update for two weeks. Are there any recommendations?

When I try to update my Apple TV software, I get an error message "update was unsuccessful try again later". I've tried downloading the update for two weeks. Are there any recommendations?

If your problem persists get yourself a micro USB cable (sold separately), you can restore your Apple TV from iTunes:
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Connect the micro USB cable to the Apple TV and to your computer.
Reconnect the power cable (only for Apple TV 3)
Open iTunes.
Select your Apple TV in the Devices list, and then click Restore.
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When I try to migrate vision builder to labview I get an error message

when I try to migrate vision builder to labview I get an error message "Error at Labview code creation step #6"

Does the error seem to be occurring at the same step in your Vision Builder AI script? See if you can determine if a certain step introduces the error by trying different modifications of your script and/or generating LabVIEW code from a Vision Builder AI example inspection. Also, are you using IMAQ Vision 7.0 for LabVIEW or a previous version of the Vision software?
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Add-on could not be installed because Firefox cannot modify the necessary file.

I see that for the issue:
<Add-on> could not be installed because Firefox cannot modify the necessary file.
The usual fixes include:
- ensuring that xpinstall.enabled is set to true
- ensuring that extensions.alwaysUnpack is set to true
What might be the non-usual fixes as I have set both to true and I still get the message above.
I have tried installing the <add-on> after I have set the values to true, then again after restarting my browser, then again after restarting my computer and finally tried creating a new profile and repeated each of the steps after setting the 2 preferences to true.

Can you at least update to the latest Firefox 10.0.10 ESR version?
Firefox 10.0.x ESR:
*http://www.mozilla.org/en-US/firefox/organizations/all.html
So a new profile with no other extensions didn't work as well?
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
Which extension is causing this problem or can't you install any extensions at all?
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons

When going through the download process with social monkee and getting to the point of adding it to firefox I get the following message: 'Social Monkee could not be installed because firefox cannot modify the needed file'. How can this be fixed?

When going through the download process with social monkee and getting to the point of adding it to firefox I get the following message: 'Social Monkee could not be installed because firefox cannot modify the needed file'. How can this be fixed?

That is usually caused by a missing unpack directive (<em:unpack>true</em:unpack>) in the file install.rdf of that extension.
See https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
-----

When I try to download an iTunes software update I get an error message that my start up disk does not have enough room. What do I do?

When I try to download an iTunes software update i get an error message that my start up disk does not have enough room. What do I do?

You probably have run out of space, I would delete (or move to an external drive) things that aren't being used as much.

My Adobe Acrobat 9 Standard stopped working after I performed an msconfig. I get the following message: "You cannot use this product at this time. You must repair the problem by uninstalling and reinstalling this product..." I installed this on Jan. 7, 20

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Hi Ali,
You can download Acrobat 9 Std. from: https://files.acrobat.com/a/preview/8d640488-4a92-4f7d-b50b-d8eb7f96bff8
and reinstall the software.
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Rave

I tried to install Selenium IDE and got message "Selenium IDE Java formatter could not be installed because it is not compatible with Firefox 5.0". How can I uninstall Firefox 5.0 and roll back to a version that works with Selenium IDE? - 22 Jun-2011

I tried to install Selenium IDE and I am getting the message:
'''Selenium IDE Java formatter could not be installed because it is not compatible with Firefox 5.0''

You can turn off compatibility checking, but more and more of the Google Toolbar will not work. Google is no longer supporting the Google Toolbar so you should use the alternatives.
Hi Mark,
See http://kb.mozillazine.org/Using_Google_Toolbar_features_without_toolbars
If you have an aspect that is not covered, indicate what that is; otherwise, expect you to be fully functional within 1-2 weeks.
 Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.

I'm attempting to install cs6 and after hitting install the following message appeared: installer failed to initialize. please download adobe support advisor to detect the problem. well that has been discontinued...

i'm attempting to install cs6 and after hitting install the following message appeared: installer failed to initialize. please download adobe support advisor to detect the problem. well that has been discontinued...

rename OOBE Folder to OOBE.old.
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64 bit OS: Program Files x86\Common Files\Adobe\OOBE
32 bit OS: Program Files \Common Files\Adobe\OOBE

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When I try to add on and add-on I get the following message..."(add-on name) could not be installed because FireFox could not modify the needed file"; What is wrong?

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