Trying to make an extension for Chrome to translate Gmail messages that I type and I need to refer to the first message in the thread to identify its language. This question inspired me and I guess I need pretty much the same solution but for an already sent messages. How can I refer to Gmail's textbox?
Screenshots:
- https://gyazo.com/0fbef2f2b368328c9e153d0397f05c7e — that's what I want to refer to;
- https://gyazo.com/3a41a3c90cdd14e323a284e2f9ff56b7 — some course code of the page.
