If you're on macOS, you can do a small piece of this natively with AppleScript (or anything that can send apple events) in Chrome or Safari -- namely, you can iterate through windows or tabs, view their source code, and execute arbitrary javascript you pass (there's a one time security option you have to accept). This can be handy for quick automations if you don't want to install anything.
(Background: I have RSI, so I've been developing some integrations between applications and Talon Voice (https://talonvoice.com/). AppleScript ends up being surprisingly valuable/fast/reliable for applications that support it. I also built an integration with iTerm2's Python API before noticing that everything I was trying to do was already supported by its AppleScript dictionary, and was faster. In Google Chrome, the "iterate through tabs and execute javascript in them" is very useful for automating Google Meet muting/unmuting.)
Nothing against this excellent project though; I'm a big fan of Omar's Twitter! And I suspect most here will appreciate the easier scriptability of the filesystem approach than dealing with the atrocious syntax of AppleScript.
(Background: I have RSI, so I've been developing some integrations between applications and Talon Voice (https://talonvoice.com/). AppleScript ends up being surprisingly valuable/fast/reliable for applications that support it. I also built an integration with iTerm2's Python API before noticing that everything I was trying to do was already supported by its AppleScript dictionary, and was faster. In Google Chrome, the "iterate through tabs and execute javascript in them" is very useful for automating Google Meet muting/unmuting.)
Nothing against this excellent project though; I'm a big fan of Omar's Twitter! And I suspect most here will appreciate the easier scriptability of the filesystem approach than dealing with the atrocious syntax of AppleScript.