Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I have been trying to install addons (Adobe PDF Reader & Flash) they both download but WILL NOT RUN!

  • 2 replies
  • 2 have this problem
  • 7 views
  • Last reply by etgatlin

more options

Did not run in Microsoft Security essentials even with Real Time Protection turned off.

Now Running Kaspersky Pure (as of yesterday) and won't install either.

Did not run in Microsoft Security essentials even with Real Time Protection turned off. Now Running Kaspersky Pure (as of yesterday) and won't install either.

All Replies (2)

more options

Upgrade your browser to Firefox 8 and check

more options

I upgraded to Firefox 8.0.1 and it didn't help at all!

Will not auto or manual install.