You can use the nostrichat extension that i created some time ago https://github.com/gzuuus/nostrichat-extension see the 'What else can you do?' Section.

For example you can open a tab o a browser window with chat.punkhub.me/?dm=40b9c85fffeafc1cadf8c30a4e5c88660ff6e4971a0dc723d5ab674b5e61b451 and you would be able to write me a dm 🤙