Firefox will not install addons

After getting a new computer and installing Firefox 12 on it, Firefox will not install addons. The only way that I can get it to install anything is by downloading the .xpi file and manually installing it. Unfortunately, I cannot download the .xpi file to one of the addons that I need to do my work, so this is a problem. Does anyone have any suggestions?

Try to disable hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://support.mozilla.org/kb/Unable+to+install+add-ons
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Hi All
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Turn off ZoneAlarm.
“Run as administrative” Firefox.
I then went to the following install page which works:
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It installed.
The following install page does not work:
http://get.adobe.com/flashplayer/
The following thread discusses the problem with http://get.adobe.com/flashplayer/ download.
Install Flash Plugin Manually in Firefox on Vista
With so many Firefox users, Adobe needs to fix the http://get.adobe.com/flashplayer/ download for Win7 users.

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'''Intel HD 2000/3000: '''
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64bit https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23764
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* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
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Firefox will not install addons

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