From https://bugzilla.mozilla.org/show_bug.cgi?id=1366220

STRs if running in firefox:

1. debug any file
2. CTRL/CMD+F
3. type something for which you find matches in the file
   
4. switch to another tool
5. switch back to debugger

• ER: the search should still show the same status
• AR: the search shows "no results"
  

STRs if running in content:
Instead of steps 4&5, resize the window to be small enough to switch to vertical layout, this triggers the same issue.