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Firefox Underscore (_) Problem

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Please let me know if the underscore Mark in pop up menu (by right clicking in web pages) & in settings a problem or it's default. I installed firefox in windows 10 yesterday & had this problem.

Please let me know about it.

Thank you

Please let me know if the underscore Mark in pop up menu (by right clicking in web pages) & in settings a problem or it's default. I installed firefox in windows 10 yesterday & had this problem. Please let me know about it. Thank you
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That underscore indicates a keyboard shortcut.

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That are keyboard access keys that you can use for keyboard navigation. For webpages including built-in about: pages like about:preferences you invoke an underlined setting via Alt + Shift + access key.