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I tried a custom JavaScript function in Firefox & tried it in Chrome but it only worked in Chrome. (I did not restart Firefox before trying it in Firefox so...
> > > I tried a custom JavaScript function in Firefox & tried it in Chrome but it only worked in Chrome. (I did not restart Firefox before trying it...
Stating the version of Chrome might be useful to help people fix it.
It's easy. 1. Create a new shortcut & set the behavior to run JavaScript. 2. Click the small arrow on the top left corner. 3. Type in the JavaScript code...
I don't know but this might help:  (This is in the Firefox description, I don't know about chromium though)
Then I don’t know.
You can do that using the "Execute Javascript Code" option. Simulate a keypress event with the keycode set to 255. More about that [here](https://stackoverflow.com/a/12187302).
This is what it says in the description: 
You could try the [Gmail API](https://developers.google.com/gmail/api).