Please reinstall this way : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 61.0.1 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

Hello, Pkshadow. I'm not sure you fully understood the issue: since the profile is retained, the bug was, too. I can create a new profile now in any installation of Firefox and this bug does not exist.

I followed your steps to a tee (e.g., waiting an hour for Disk Cleanup, which was 7GB, to finish). After uninstalling, no mention of Mozilla in any of the three folders you specified (hidden items turned on Windows Explorer).

The bug is present. The new install has not made a single difference. After I close Firefox (the brand-new fresh install as you recommended), I am logged out of LastPass.

I also completely replicated your steps on a second system: again, no difference.

To clarify for Pkshadow and others: even in the same install, I can create a new profile and the issue disappears. The issue seems quite connected to my current profiles on both machines.

Ok, that is 1 step forward. So with a new Profile you have Last Pass does it break again after adding the other Extensions you were using ?

Or is the issue now Fixed and you no longer need support ? If that is so, please mark your answer as the solution to the issue so others can find it.

Yes. After around 4-6 weeks, each profile seemingly "dies" (i.e., LastPass refuses to stay logged in) and I need to begin a new profile. It happens on both systems in the same time frame (which are on the same local LAN and connected to the same Firefox account), as well. One Dell laptop and one custom PC.

Pkshadow said

Ok, that is 1 step forward. So with a new Profile you have Last Pass does it break again after adding the other Extensions you were using ? Or is the issue now Fixed and you no longer need support ? If that is so, please mark your answer as the solution to the issue so others can find it.

I apologize for the delay. A new profile + adding the previously used extensions = no bug.

I thought the issue had been fixed on July 29th, but the "fix" actually only lasted a few hours. Since then, each day, I need to log into LastPass ~13 times per day. 13 logins. Imagine having to log into your email every time you opened it. :(

See the attached image.

I can create a new profile, add all the old extensions, and there won't be any issues*. * = until about 4-6 weeks later.

Hi, what Security Programs are you using ? Are you using any Cleaner type programs , such as ccleaner or PC something or other.... ?

Have you checked your A/V logs for any thing turning up ? Also have you checked or monitored Event Viewer to see if a fail turns up in there or in a Windows process. ?

What do you have setup in Task Scheduler to perform at around the date this goes corrupted ?

Hi!

1. Security program is Avira Free.

2. No cleaner programs whatsoever, however some noted CCleaner has actually fixed this problem:

LastPass Forums - Staying logged in to LP

However, after the major CCleaner security breach and over-reaching deletions, I've hesitated. Is Firefox meant to be used with CCleaner? I always thought it was kind of a "you're on your own if you modify our files with a 3rd-party program".

3. AV logs are silent except for updates and scans. I went back 6 weeks and it's got nothing.

4. Event Viewer: not much, but I do get these occasionally. They do not line up with the session expirations, which are ~13+ times a day, but these are about once a week. I've sent these to LP already and I'll let you know what I hear back. But...these came ~4 weeks after the issue began, so it doesn't seem related.

Faulting application name: firefox.exe, version: 61.0.1.6759, time stamp: 0x5b3c251a Faulting module name: lastapphook_x64.dll, version: 1.0.0.1, time stamp: 0x5b48dafd Exception code: 0xc0000005 Fault offset: 0x0000000000005a23 Faulting process id: 0x352c Faulting application start time: 0x01d425ef73cd86ce Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: C:\Program Files (x86)\LastPass\lastapphook_x64.dll Report Id: 58f67344-e7cf-48b8-9439-4ec8882d8149 Faulting package full name: Faulting package-relative application ID:

But, at the same time, there are these generic ones about Firefox, as well, but only for two days (from a poorly coded website I was troubleshooting):

Faulting application name: firefox.exe, version: 61.0.1.6759, time stamp: 0x5b3c251a Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000 Exception code: 0xc0000005 Fault offset: 0x0000000000000000 Faulting process id: 0x1c50 Faulting application start time: 0x01d42563264722d1 Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: unknown Report Id: 5a0c25d1-096a-4643-bc69-07eee0043272 Faulting package full name: Faulting package-relative application ID:

5. Task Scheduler: nothing set for this 4-6 week time period. :(

<<

LastPass has replied to my ticket again and I'm sending logs, for the 3rd time. I'll keep updated if I hear anything, as I do believe it's a bug on their end (none of my other extensions log out, those that need a login), but who knows?...

Thank you for the reply.