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Firefox converts to Responsive Design Mode when I click the "back" button on my mouse

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Today is October 29, 2021. A few hours ago, when I started clicking the "Back" button on my house, my Firefox screen could convert to Responsive Design Mode, which is something I did not even know existed before today. If I then click the "Forward" button on my mouse, the "Manage Bookmarks" window opens. This started all of a sudden. When I click the forward and back buttons on the browser itself, it works fine. The problem occurs when I click the forward and back buttons on my mouse. I have not changed my mouse settings or done anything with the mouse software. My mouse is a Logitech MX Master 3.

Today is October 29, 2021. A few hours ago, when I started clicking the "Back" button on my house, my Firefox screen could convert to Responsive Design Mode, which is something I did not even know existed before today. If I then click the "Forward" button on my mouse, the "Manage Bookmarks" window opens. This started all of a sudden. When I click the forward and back buttons on the browser itself, it works fine. The problem occurs when I click the forward and back buttons on my mouse. I have not changed my mouse settings or done anything with the mouse software. My mouse is a Logitech MX Master 3.

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The shortcut for RDM is Ctrl+Shift+M and the shortcut to open the Bookmarks Manager is Ctrl+Shift+O, so it sounds that the Logitech mouse settings are configured to these shortcuts when you press these mouse buttons. Back would normally be "Alt+cursor-left" and Forward would be "Alt+cursor-right", so you need to check the mouse driver settings.

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Thank you for replying. That is the first thing I thought. I checked my mouse settings, and the back button is set to back only, and the forward button is set to forward only, so I am still looking for what happened in the past few hours that caused this problem. I have also since downloaded the latest version of Firefox (Version 93.0 64-bit) and installed it hoping that might reset some setting that got accidentally changed, but that did not fix the problem.

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Maybe also check the settings of the Logitech SetPoint extension that shows in the troubleshooting information.

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I am not having the issue with Edge or Chrome, so I will uninstall the mouse software, reinstall it, and see if that solves it. Thank you for your help. I really appreciate it.

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Things appear to be working normally again. I did not actually uninstall and reinstall the mouse software. I will keep browsing and see if the problem arises again. I hope it does not, but for now, using my mouse for forward and back works normally.