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Sync never completes

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Windows 10 (1903). Quite often I find that sync never completes, the spinning wheel, it just keeps spinning. I have to exit Firefox and restart, and upon restart I need to kill the previous Firefox instance. Then, and only then, will sync work. But not for long, usually in a few hours it's hung up again. This only happens on my Windows 10 machine (sync works fine with my FF mobile and Windows 7 devices).

Windows 10 (1903). Quite often I find that sync never completes, the spinning wheel, it just keeps spinning. I have to exit Firefox and restart, and upon restart I need to kill the previous Firefox instance. Then, and only then, will sync work. But not for long, usually in a few hours it's hung up again. This only happens on my Windows 10 machine (sync works fine with my FF mobile and Windows 7 devices).
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

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My_Cheese_Is_Slippin'
  • Top 10 Contributor
61 solutions 739 answers

Hi Drewskers, Check into why Firefox is hanging. See this article for some help with that: Firefox hangs or is not responding - How to fix

Hi Drewskers, Check into why Firefox is hanging. See this article for some help with that: [https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding Firefox hangs or is not responding - How to fix]
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Question owner

My_Cheese_Is_Slippin' said

Hi Drewskers, Check into why Firefox is hanging. See this article for some help with that: Firefox hangs or is not responding - How to fix

Thanks for the reply but that article doesn't address the problem I am having. Specifically, Firefox is not hanging! I can still browse normally.

The problem is that Firefox SYNC starts but never completes. It is the SYNC icon, visible under my account name in the 3-bar menu in the upper right corner, that spins perpetually. I hope that clarifies the issue!

''My_Cheese_Is_Slippin' [[#answer-1247229|said]]'' <blockquote> Hi Drewskers, Check into why Firefox is hanging. See this article for some help with that: [https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding Firefox hangs or is not responding - How to fix] </blockquote> Thanks for the reply but that article doesn't address the problem I am having. Specifically, Firefox is not hanging! I can still browse normally. The problem is that Firefox SYNC starts but never completes. It is the SYNC icon, visible under my account name in the 3-bar menu in the upper right corner, that spins perpetually. I hope that clarifies the issue!
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FredMcD
  • Top 10 Contributor
4245 solutions 59390 answers

We need to look at the sync logs.

Note: Do the following for each problem system/profile. And label each as to what system/profile.

Type about:sync-log<enter> in the address bar.

Open the last file created and Copy its contents Now Paste it into this forum.

If the file is too large;


Open a text/word program and load the file. Left-click once. Now <Control> A to highlight everything, then <Control> C to copy it.

Next, have your web browser go to; https://pastebin.com/

Paste <Control> P the content of the file in the window. Note: On the bottom, fill out the boxes as best you can.

Now press Create A New Paste. The page will reload. Copy the new web address, and post it here.

We need to look at the sync logs. Note: Do the following for each problem system/profile. And label each as to what system/profile. Type ''' about:sync-log'''<enter> in the address bar.   Open the last file created and '''Copy''' its contents Now '''Paste''' it into this forum. If the file is too large; Open a text/word program and load the file. Left-click once. Now '''<Control> A''' to highlight everything, then '''<Control> C''' to copy it. Next, have your web browser go to; '''https://pastebin.com/''' Paste '''<Control> P''' the content of the file in the window. '''Note: ''' On the bottom, fill out the boxes as best you can. Now press '''Create A New Paste. ''' The page will reload. Copy the new web address, and post it here.
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cor-el
  • Top 10 Contributor
  • Moderator
17467 solutions 157838 answers

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

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems. *https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/ *https://www.7tutorials.com/4-ways-boot-safe-mode-windows-10
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Question owner

FredMcD said

We need to look at the sync logs.

Thanks FredMcD. I have just one profile. Here is the latest sync log that captures a failure. (There's been a couple of successful syncs since then, that I initiated manually).

https://pastebin.com/51neReX8

''FredMcD [[#answer-1247241|said]]'' <blockquote> We need to look at the sync logs. </blockquote> Thanks FredMcD. I have just one profile. Here is the latest sync log that captures a failure. (There's been a couple of successful syncs since then, that I initiated manually). https://pastebin.com/51neReX8
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FredMcD
  • Top 10 Contributor
4245 solutions 59390 answers

cor-el I see errors after line 40

'''cor-el''' I see errors after line 40
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