Originally reported here:
https://github.com/firefox-devtools/debugger/issues/8260

Keyboard shortcut for finding next occurrence of search term not working on Windows, opens 'Go to line' prompt instead.

Firefox Nightly 70.0a1 20190816215314, Firefox beta 69.0b14

The keyboard shortcut for finding the next occurrence of a search term does not work, at least on Windows. It opens the 'Go to line' prompt instead.

The source search ind next command key is defined in sourceSearch.search.again.key3=Cmd+G (from bug 1488662). That bug also added gotoLineModal.key3=Ctrl+G. Searching for the previous match with sourceSearch.search.againPrev.key3=Cmd+Shift+G works.

Steps to reproduce:

1. Open the debugger, e.g. with github open.
2. Open search across files by pressing Ctrl+Shift+F
3. Search for let.
4. Click on one of the the files from the result.
5. Click on one of the matches.
6. Press Ctrl+Shift+G (finding previous match, works).
7. Press Ctrl+G (finding next match) - doesn't work. F3 also doesn't work but opens the browser's Find In Page bar.

Expected: No confusion about Ctrl+G, shortcut to go to next match.

:Honza, if you think that's a regression, then could you try to find a regression range in using for example mozregression?

I'm currently seeing this on Mac as well, hence updating title. Cmd-shift-G does work.