"Open all" buttons for forum and studio activity in Scratch Messaging

[mxmou]

Is your feature request related to a problem? Please describe.

I usually follow forum topics I'm interested in, so I get a lot of forum messages. Similarly, some people might curate many studios and get activity messages for them. Currently if I want to see new posts in every topic I'm following I have to open the popup and click a link for every topic.

Describe the solution you'd like

There should be a button to open all forum messages, each in its own tab. Same for studio messages.