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I use and to move between tabs. I want to transfer this setting to Safari.

The default Safari keyboard shortcuts shown in the menu bar list [ and ] for Back/Forward:

Default keyboard shortcuts.

Despite those keyboard shortcuts, Safari also seems to use CMD-Left and CMD-Right for Back/Forward.

I can set my desired keyboard shortcuts in System Preferences > Keyboard > Shortcuts:

custom keyboard shortcuts set

This now works, partially. If the current tab has no Back/Forward history, the browser will navigate to the next or previous tab.

BUT, if the current tab does have Back/Forward history, my custom keyboard shortcuts do not work. Safari instead uses the default (but not listed in the menu bar) Back/Forward commands.

Why do these secondary keyboard shortcuts exist in Safari? Where can they be customized? How can they be removed?

macOS 10.13.6, Safari 12.0

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2 Answers 2

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It seems like this is a widespread issue. I tried redefining shortcuts such as creating new windows, but although the shortcut appears in the menu bar it doesn't actually work—Safari uses the default extension. This happens for other Safari menu bar items as well.

Sadly this doesn't seem to have been fixed even on Safari 14 (shipped with macOS Big Sur).

In order to overcome this strange limitation/bug, I use BetterTouchTool to set up custom keyboard shortcuts, and it works pretty well.

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I can / must confirm your experience. I tried your custom shortcuts in Safari– they ONLY work in tabs without "history".

I tried to google this phenomenon but didn't find much help, either.

Btw, did you notice that these two "stubborn" shortcuts work also with finder windows? So they might be valid system wide and kind of default.

At last I found a reliable source, stating:

The following keyboard shortcuts are either reserved by the system or well-known by users.

Primary Key Keyboard Shortcut Action
Left arrow Command-Left arrow Change the keyboard layout to current layout of system script.

So CMDLeft arrow is definitely a "reserved shortcut", though with an unexpected "mission"...

(Me: MacOS 13.6, Safari 11.1, PC keyboard)

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