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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

After downloading Firefox updater 25.0.1 Firefox will not open. Help!!! Thanks!

  • 2 replies
  • 5 have this problem
  • 4 views
  • Last reply by jh13301

jh13301
jh13301
more options

I downloaded the update for 25.0.1 and ran it. Instead of rebooting I shut down the laptop (Vista Home SP2, 64 bit). When I booted the laptop again I tried to open Firefox but Norton Internet Security File Insight could not verify the updater as a trusted file and did not allow Firefox to open. I tried to turn off File Insight but got the same results. I ran Live Update to update Norton Internet Security, and then tried to open Firefox again. This time Norton Internet Security displayed a message saying that updater.exe was unsafe and been deleted. When I try to open Firefox, Norton now detects Updater 25.0.0.5046, says it's trusted, but Firefox does not open. I want to save the history if possible. How can I get Firefox to work again with the history saved? Thank you!

I downloaded the update for 25.0.1 and ran it. Instead of rebooting I shut down the laptop (Vista Home SP2, 64 bit). When I booted the laptop again I tried to open Firefox but Norton Internet Security File Insight could not verify the updater as a trusted file and did not allow Firefox to open. I tried to turn off File Insight but got the same results. I ran Live Update to update Norton Internet Security, and then tried to open Firefox again. This time Norton Internet Security displayed a message saying that updater.exe was unsafe and been deleted. When I try to open Firefox, Norton now detects Updater 25.0.0.5046, says it's trusted, but Firefox does not open. I want to save the history if possible. How can I get Firefox to work again with the history saved? Thank you!

Chosen solution

Hi iamjayakumars - I was not able to create a new profile because profile manager would not open. A Norton message would appear "Updater.exe is safe." but nothing else would happen. But - the links you sent were very helpful, and I was able to solve the problem by doing a un-installing and then re-installing Firefox: 1. Backing up the profile. 2. Downloading the Firefox installer from Mozilla.org with another browser. 3. Un-installing Firefox from the Control Panel (making sure "Remove my Firefox personal data and customizations" was NOT selected. 4. Re-installing Firefox. Firefox started up correctly with all my old settings and all the tabs I had open the last time it was used appeared as I had hoped. Thanks very much for your help!

Read this answer in context 👍 0

All Replies (2)

iamjayakumars
iamjayakumars
more options

Create a new profile as a test to check if your current profile is causing the problems. See "Creating a profile":

Profile Backup and Restore

jh13301
jh13301 Question owner
more options

Chosen Solution

Hi iamjayakumars - I was not able to create a new profile because profile manager would not open. A Norton message would appear "Updater.exe is safe." but nothing else would happen. But - the links you sent were very helpful, and I was able to solve the problem by doing a un-installing and then re-installing Firefox: 1. Backing up the profile. 2. Downloading the Firefox installer from Mozilla.org with another browser. 3. Un-installing Firefox from the Control Panel (making sure "Remove my Firefox personal data and customizations" was NOT selected. 4. Re-installing Firefox. Firefox started up correctly with all my old settings and all the tabs I had open the last time it was used appeared as I had hoped. Thanks very much for your help!