[whatever1]

A fellow HN member recommended this https://contexts.co/.

It is amazing feature-wise, but it has some annoying bugs and it seems abandonware (last update Aug 2022).

[0x2a]

One alternative for window switching is Alfred:

https://alfred.app/workflows/alfredapp/window-switcher/

Workflows for browser tabs aren't as up-to-date though:

https://alfred.app/workflows/epilande/browser-tabs/

https://github.com/deanishe/alfred-firefox