about the change in size, I have a question.
(I am Korean, It's a translator. Please understand even if it's awkward.)
1. I saw a blog post in the past and set up a browser. (use -> about:config)
2. when I turn on the browser after that, the size of the browser is always initialized.
3. I think the settings are synchronized to my account. Reinstalling Firefox has the same symptoms.
I can't solve it even if I find a Korean website. Help me
Do you remember what changes you made ?
You can check for problems with preferences. You can delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases.
You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).
- Help -> More Troubleshooting Information -> Profile Folder/Directory:
Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder