user.js: `browser.startup.blankWindow` can block RFP newwin and maximize/restore is confusing

Pref browser.startup.blankWindow

• opens Firefox maximised
• indents tab as if it’s in windowed
• breaks “Restore Down” button

I’m experiencing the first two issue since several Firefox version ago (can’t recall exactly). Firefox 109 breaks the “Restore Down” button with browser.startup.blankWindow set to False (4507). Mainly reporting this to confirm this is not something only on my end.

🟥 https://github.com/arkenfox/user.js/wiki/5.2-Troubleshooting

• I have read the troubleshooting guide, done the checks and confirmed this is caused by arkenfox
  • unchecked issues may will be closed as invalid

🟪 REQUIRED INFO

• Browser version & OS: Firefox 109 & Windows 10

• Steps to Reproduce (STR):

  1. Create a new profile with the Profile Manager.
  2. Set the new profile as default profile.
  3. Open the new profile twice to go through the initiation stuffs.
  4. Close all Firefox instance.
  5. Open Firefox, notice the layout and the behaviour of “Restore Down” button.
  6. Close Firefox, add the default user.js into the new profile.
  7. Remove 4507 from user.js
  8. Repeat step 5.
  9. Repeat Step 1-4, 6.
  10. Repeat step 5.

• Expected result: In the end of step 5, 8, and 10, Firefox opens in windowed view with working “Restore Down” button; tab is indented; tab indent is removed upon maximising.

• Actual result: In the end of step 10, Firefox opens maximised with tabs indented inward; the “Restore Down” button does nothing upon being clicked.

• Console errors and warnings: Nothing.

• Anything else you deem worth mentioning: I can only reproduce the problem from “cold start”, hence the complicated STR.

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