The shortcut for creating links in the editor component (⌘-shift-a) is unreliable doesn't work in Firefox(and other browsers) on Windows and Linux:

Test results on multiple browsers and OSs below

Linux and Windows

Browser: Firefox

Steps to reproduce

1. Select text.
2. Press Meta(Super) + Shift + A

Expected result

Link creation dialog

Actual result

Nothing

Windows

Browser: Edge

Steps to reproduce

1. Select text.
2. Press Meta(Super) + Shift + A

Expected result

Link creation dialog

Actual result

Types uppercase A

Linux and Windows

Browser: Chromium and Chrome

Steps to reproduce

1. Select text.
2. Press Meta(Super) + Shift + A

Expected result

Link creation dialog

###Actual result
Link creation dialog

Linux

Browser: Epiphany

Steps to reproduce

1. Select text.
2. Press Meta(Super) + Shift + A

Expected result

Link creation dialog

Actual result

Types uppercase A

A good keybinding for the link creation dialog would be either:

• Ctrl + K like WP-Admin
• Alt + Shift + a / Control + Option + a like Calypso

If someone can test on Mac OS, it would be great :)