It doesn't do much other than modify how Gmail is displayed in Chrome. Does it as minimally as possible (that I can engineer). Done locally.
Currently built the following settings:
Conversations:
* Show newest message first
* Show every message in a thread (sometimes they're collapsed into numbered bubbles)
* Remove AI overviews (retches)
Layout/UI:
* Minimize the search & top bar
* Minimize the far left "rail" (Mail/Chat/Meet)
* Hide a bunch of extraneous icons/buttons/items
* Adjust width of Folders/Labels column (still in-process)
Mini-Automations:
* Automatically open to inbox on page start/refresh
* Automatically select first message if the reading pane is open (unless unread, or previous message already selected)
* Add a recurring reminder (if wanted) to use Gmail's new Manage Subscriptions folder/feature
Bunch more features I'd like to add. Let me know if you think I should change anything. Or if you have any code/bug feedback... :)