Tablerone supports the following keyboard shortcuts:

Action Shortcut Mac Shortcut Win
Activate the extension ( = click toolbar button) ⌘ Cmd + ⇧ Shift + . Ctrl + ⇧ Shift + .
Save tabs to a new collection ⌘ Cmd + ⇧ Shift + , Ctrl + ⇧ Shift + ,
Save and close all windows ⌘ Cmd + ⇧ Shift + 0 Ctrl + ⇧ Shift + 0
Open Tablerone in new tab ⌘ Cmd + ⇧ Shift + L Ctrl + ⇧ Shift + L

You can change them to custom key mapping within browser’s settings:
chrome://extensions/shortcuts