[Bug] Vimium stops working after moving a tab into new window with W on Firefox on macOS

Describe the bug

Vimium stops working after moving a tab into new window with W on Firefox on macOS.

To Reproduce

Steps to reproduce the behavior:

1. Start with https://news.google.com as an example, as you can scroll down on this page to test if Vimium is working or not.
2. Press W to move the tab into a new window.
3. In the new window with the Google news page, Vimium stops to any keyboard commands, for example, j to scroll down, or f for link jumps.
4. However, if you do something else with the browser, e.g., press cmd + T to create a new tab, and press cmd + W to close it to go back to the Google news page, then Vimium will resume to respond to keyboard commands like j for scroll down.

Browser and Vimium version

As shown in Firefox's about:support and about:addons pages:

Reproduce the issue in Firefox on macOS by moving a tab with W into a new window, then test j and f before and after opening and closing another tab. Trace the browser-extension lifecycle around the new window and determine what must be restored so Vimium responds immediately after the move; verify the same commands work without the workaround.