Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Lolu chungechunge lwabekwa kunqolobane. Uyacelwa ubuze umbuzo omusha uma udinga usizo.

Command-option-up and command-option-down keyboard shortcuts were stolen from websites

I regularly use a website which intercepts command-option-up and command-option-down for its own navigation. This is a central part of my workflow with this website, and without it it becomes completely unusable.

After updating to Firefox 140.0.4, these shortcuts are now used by the browser to switch tabs. I have not found any way to configure this. Am I missing some obscure way to do this or is this just impossible?

I imagine this change was made to support vertical tabs, but I'm not using those, so the command-option-left and command-option-right shortcuts make more sense for my horizontal setup. (I don't use those shortcuts either, though- I use ctrl-tab and ctrl-shift-tab!)

I regularly use a website which intercepts command-option-up and command-option-down for its own navigation. This is a central part of my workflow with this website, and without it it becomes completely unusable. After updating to Firefox 140.0.4, these shortcuts are now used by the browser to switch tabs. I have not found any way to configure this. Am I missing some obscure way to do this or is this just impossible? I imagine this change was made to support vertical tabs, but I'm not using those, so the command-option-left and command-option-right shortcuts make more sense for my horizontal setup. (I don't use those shortcuts either, though- I use ctrl-tab and ctrl-shift-tab!)

All Replies (6)

I found where this change was made: https://bugzilla.mozilla.org/show_bug.cgi?id=1965273

Based on the diff, it does look like there is simply no way to configure this. Is this the right place to request that this be configurable?

I've also filed a bug here: https://bugzilla.mozilla.org/show_bug.cgi?id=1976320

Okulungisiwe ngu rpjohnst

No this is not the right place - sounds like key bindings on a mac. What do you think firefox can do?

These are not keybindings implemented by macOS. They are keybindings implemented by Firefox, running on macOS. See the bugzilla link.

Most keyboard shortcuts can be intercepted and repurposed by websites. There are just a few that Firefox doesn't allow sites to override (like Command+W to close the current tab). Since it's not your site, it's not obvious how you could enhance its code to avoid changing tabs. Could you mention the problem to the site?

> There are just a few that Firefox doesn't allow sites to override (like Command+W to close the current tab).

This is the whole problem with these particular new shortcuts. If Firefox allowed them to be intercepted and repurposed then the site would have simply continued working.

rpjohnst said

> There are just a few that Firefox doesn't allow sites to override (like Command+W to close the current tab). This is the whole problem with these particular new shortcuts. If Firefox allowed them to be intercepted and repurposed then the site would have simply continued working.

I don't have a Mac so I can't test. Also, I don't know what site you're using, so I can't look at their code.