We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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.

Can't install Firefox; says "may not be able to " use allof the features of the new program.

  • 1 reply
  • 14 have this problem
  • 31 views
  • Last reply by cor-el

margotlive
margotlive
more options

Had a link to Firefox on my taskbar. Said the program was no longer available. Deleted the shortcut. Can't find Firefox when I search Programs and Files. Downloaded FF 17. Run the download. Says that I may not be able to use all the items of the new program. Asks me to sign in as Administrator or use current sign-in. I AM the administrator. No combination of Name and Password work

Had a link to Firefox on my taskbar. Said the program was no longer available. Deleted the shortcut. Can't find Firefox when I search Programs and Files. Downloaded FF 17. Run the download. Says that I may not be able to use all the items of the new program. Asks me to sign in as Administrator or use current sign-in. I AM the administrator. No combination of Name and Password work

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

If there are problems with updating then best is to download the full version of the Firefox installer.

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.

  • Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.

Check that Firefox isn't set to run as Administrator. Right-click the Firefox desktop shortcut and choose "Properties". Make sure that all items are deselected in the "Compatibility" tab of the Properties window.

  • Privilege Level: "Run this program as Administrator" should not be selected
  • "Run this program in compatibility mode for:" should not be selected

Also check the Properties of the firefox.exe program in the Firefox program folder (C:\Program Files\Mozilla Firefox\).