What i wanna do?

Copy code from my editor, go to 'SUBMIT' tab, paste it, click Submit button.

Whats the problem?

I don't wanna use my mouse or my touchpad to do this. I can go upto pasting the source code by pressing 'Tab' (It goes to the next interact-able item on a webpage), but once there 'Tab' just adds space in my code, it doesn't select the 'Submit' button. I have to use my mouse for that.

Solutions?

I was wondering if its possible to add a shortcut to press the submit button via a custom made extension. Is it? Or in any other way?

Why I wanna do it?

Because it would make me feel cooler.

Relevant Info maybe:

I'm running Ubuntu on a lenovo laptop. I use brave and firefox.