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Firefox won't open with maximized window after login, and it happens across different Windows OS.

  • 9 replies
  • 1 has this problem
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  • Last reply by FredMcD

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Firefox will never ever open in maximized window after I log in with my Firefox account and make some changes to the toolbars. Advanced properties to make maximizing default won't work either. It hasn't worked for many Firefox versions I've tried and that caused me to use Chrome. But if you manage to fix this problem, I'll be more than happy to stick with Firefox.

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What are you logging into?

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Of course I log into Firefox with my account for syncing. Some said that this problem is caused by corrupted profile file, but it's not possible since I re-installed Windows many times and the problem was not fixed.

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3So if you don't log into sync, there is no problem?

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FredMcD said

So if you don't log into sync, there is no problem?

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It seems so, but that also means I don't touch any toolbar modifications as well. However the UI of Firefox is so complicated I need to make it simple, so I won't go without changing it.

P/s: The maximize on startup extension works, although there's a 5s delay.

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I called for more help. Let's try an experiment.

When you close the browser, leave sync logged in. When you start Firefox the next day, wait for sync to happen.

After: 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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https://pastebin.com/VeM4He9x

https://pastebin.com/wTQnYqPc

2 logs from Firefox on Windows 7 Ultimate SP1. I'll try to record my laptop's screen for further details on my problem.

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Modified by Csuŋ

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Well done. I called for more help.

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