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Updated to version 67.0.2 (64-bit) of Firefox. Cannot launch Firefox without being prompted to create a new profile.

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I am using Firefox Sync. Today Firefox updated to version 67.0.2 (64-bit). As I began using it I noticed some strange behavior. The first thing I noticed was that I couldn't add any additional tabs past 4 tabs (the number is irrelevant, since the number changes). Thinking that the application was frozen, I closed Firefox. Upon relaunch I get this message:

"Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an existing Firefox profile. To protect your information, create a new profile for this installation of Firefox."

I then have to either Exit or Create New Profile. I've done this several times and have had to re-do this task over and over today. I suspect that my Firefox Sync profile is corrupt. I've tried resetting Firefox, reinstalling, etc.

In about:profiles I now have several profiles in existence. One for each time I've reset using the Create New Profile button.

Does anyone have any advice on how to continue?

I am using Firefox Sync. Today Firefox updated to version 67.0.2 (64-bit). As I began using it I noticed some strange behavior. The first thing I noticed was that I couldn't add any additional tabs past 4 tabs (the number is irrelevant, since the number changes). Thinking that the application was frozen, I closed Firefox. Upon relaunch I get this message: "Using an older version of Firefox can corrupt bookmarks and browsing history already saved to an existing Firefox profile. To protect your information, create a new profile for this installation of Firefox." I then have to either Exit or Create New Profile. I've done this several times and have had to re-do this task over and over today. I suspect that my Firefox Sync profile is corrupt. I've tried resetting Firefox, reinstalling, etc. In about:profiles I now have several profiles in existence. One for each time I've reset using the Create New Profile button. Does anyone have any advice on how to continue?
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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134

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cor-el
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Do you have multiple Firefox versions installed or both 32-bit and 64-bit versions?

You can check the compatibility.ini file in each profile to see the installation path of the Firefox program last used it.

Firefox 67 and later can use a dedicated profile for each of the Firefox update channels and will lock the profile, so it can only be used by Firefox in a specific installation folder. For Release versions this profile would be a xxxxxxxx.default-release profile, profiles used in older Firefox versions usually used a xxxxxxxx.default profile (a refresh adds a time stamp). The installs.ini file stores the hash of the installation path of each locked profile.

Do you have multiple Firefox versions installed or both 32-bit and 64-bit versions? You can check the compatibility.ini file in each profile to see the installation path of the Firefox program last used it. Firefox 67 and later can use a dedicated profile for each of the Firefox update channels and will lock the profile, so it can only be used by Firefox in a specific installation folder. For Release versions this profile would be a xxxxxxxx.default-release profile, profiles used in older Firefox versions usually used a xxxxxxxx.default profile (a refresh adds a time stamp). The installs.ini file stores the hash of the installation path of each locked profile. *https://support.mozilla.org/en-US/kb/dedicated-profiles-firefox-installation *https://blog.mozilla.org/2019/01/14/moving-to-a-profile-per-install-architecture/
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@cor-el. The second link didn't work for me.

The problem seems to only happen when I use Firefox Sync. If I don't sign in to Firefox I don't have this problem.

Any other ideas?

Thanks!

@cor-el. The second link didn't work for me. The problem seems to only happen when I use Firefox Sync. If I don't sign in to Firefox I don't have this problem. Any other ideas? Thanks!
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Sorry, I forgot to answer your question. I only have the 64-bit version of Firefox installed.

Sorry, I forgot to answer your question. I only have the 64-bit version of Firefox installed.
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cor-el
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Sorry, that would be: *https://blog.nightly.mozilla.org/2019/01/14/moving-to-a-profile-per-install-architecture/ See also "Side-by-Side Profiles" : *https://hacks.mozilla.org/2019/05/firefox-67-dark-mode-css-webrender/
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@Cor-el. Thanks for the links. I'm not sure how they help though. I don't see any actionable items within them.

I can try removing all the profiles in about:profiles and logging in again, but I suspect it will not resolve the issue.

@Cor-el. Thanks for the links. I'm not sure how they help though. I don't see any actionable items within them. I can try removing all the profiles in about:profiles and logging in again, but I suspect it will not resolve the issue.
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cor-el
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This is likely a problem with profiles.ini and installs.ini that either aren't updated properly or there are otherwise problem with the created profile.

What does it say in the prompt to create a new profile? Does it mention problems with accessing a profile/

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

This is likely a problem with profiles.ini and installs.ini that either aren't updated properly or there are otherwise problem with the created profile. What does it say in the prompt to create a new profile? Does it mention problems with accessing a profile/ Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10
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