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
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Thunderbird > preferences (I think on a mac) and under attachments set the folder

I keep getting the error "zotero could not be installed because firefox cannot modify the needed file". Any suggestions on how to fix this?

After downloading Zotero (a plug in that is in theory custom-designed for firefox), I get an error message that says "zotero could not be installed because firefox could not modify the needed file". That's all the detail I have.

You get this error if you install an extension that needs to be unpacked in order to work properly, but this isn't happening. The default is to copy the file to the extensions folder and rename the file part to the ID of the extension.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref(s) on the about:config page to true.
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
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See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file if present.

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This error has been reported before in this bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=730040#c21
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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.

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You usually get this error if you try to install an extension that needs to be unpacked to work properly. 
Current Firefox version do not unpack an extension automatically, but rename the xpi file to the extension's GUID.
An extension that needs to be unpacked should have an unpack flag in its install.rdf file
<pre><nowiki><em:unpack>true</em:unpack></nowiki></pre>
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
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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

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I can not download newer themes. It continues to say So and so could not be installed because Firefox does not have the needed files. Also.. For the newer version, where is the tools option?

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You get this error if you install an extension that needs to be unpacked in order to work properly, but this isn't happening. The default is to copy the file to the extensions folder and rename the file part to the ID of the extension.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref(s) on the about:config page to true.
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file if present.

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?

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