Chrome

Add Bookmarks and History as separate "search engines"
- Settings | Manage Search Engines | Add Search Engine
- Give them a single-letter keyword each
- Bookmarks: chrome://bookmarks/?#q=%s
- History: chrome://history/?#q=%s
Now you can access those from the omnibox
- The omnibox is the browser search bar
- On Windows: Ctrl + L
- On Mac: Cmd(splat) + L
- Then enter the keyword (configured abnove - I'm using b for bookmarks and h for history) and hit Tab
- Note that on Mac Catalina I'm finding that any search term you enter directly will get crappy results, so I just enter a random character and then tab inyo the actual search text box

Gmail

To avoid playing whackamole with the infuriating toolbar at the bottom...
- To mute/unmute yourself: Cmd + D (Ctrl + D in Windows)
- To toggle video: Cmd + E (Ctrl + E in Windows)

More here
Cmd k [channel name or person name] to open new channel or direct conversation – eg Cmd + k + nagiosdeploy
- Ctrl + K on Windows
Cmd + Shift + \ - emoji reactions to someone’s post
:[emoji name] – emojis embedded in posts
`[code]` (ie text encased by back ticks) - code
Cmd + [ - go back to last channel / DM visited
Cmd + ] - go forward again
- On Windows: Alt + <- or ->
Cmd + Shift + T: Open the threads view
Cmd + Shift + M: Show "activity" / mentions - ie times when you've been @ed (also accessed via @ symbol top right)

If you want to search for a term in a particular channel: in the search box (top right):
- Like this: roadmap in:observability-priv
- Actually it’s this: roadmap in:#observability-priv
- ...but the hash symbol gets inserted for you if you forget it.

I seem to have installed this, but I think it's a free trial that only lasts 7 days?
This looks worth looking at.