You will need to install a user script manager extension to install this script.
Add hotkeys for switching between files on Overleaf (overleaf.com)
Ctrl+Shift+,: Previous file
Ctrl+Shift+.: Next file
Ctrl+Shift+/: Alt-tab style switch to previous file (most recent file)
Ctrl+I: Emphasize text (overrides default 'italicize' hotkey)
\textwhen in math mode
allto disable filtering and allow all file types