Firefox

K

Windows & Tabs
Close Tab⌘W
Close Window⇧⌘W
New Tab⌘T
New Window⌘N
New Private Window⇧⌘P
Undo Close Tab⇧⌘T
Undo Close Window⇧⌘N
Move Tab Left⌃⇧PgUp
Move Tab Right⌃⇧PgDown

History
History Sidebar⇧⌘H
Clear Recent History⇧⌘⌫

Bookmarks
Bookmark This Page⌘D
Bookmark All Tabs⇧⌘D
Bookmarks Sidebar⌘B
Show All Bookmarks⇧⌘B

Searching in Firefox
Find⌘F
Find Again⌘G
Find Previous⇧⌘G
Quick Find/
Close Find or Quick Find bar
Focus Search Bar⌘K
Search open tabs⌘K ⇧5

Miscellaneous
Complete .com Address⌃↩
Delete Selected Autocomplete Entry⇧⌫
Toggle Full Screen⇧⌘F
Toggle Reader Mode⌥⌘R
Caret BrowsingF7
Focus Address BarF6
Focus Address BarF6
Focus Address Bar⌘L
Focus Search Field in LibraryF6
Focus Search Field in Library⌘F

Media Controls
Toggle Play/PauseSpace
Decrease Volume
Increase Volume
Mute Audio⌃M

Developer Tools
Toggle Developer ToolsF12
Toggle Developer Tools⌥⌘I
Web Console⌥⌘K
Inspector⌥⌘C
Take a Screenshot⇧⌘S
Style Editor⇧F7

Tab Containers
Open Containers Panel⌃.
Open Tab in Container 1-9⇧⌘1Configure in settings