The `browser_menu_button_accessibility.js` sends [a click on a non-interactive spacer element](https://searchfox.org/mozilla-central/rev/1e726a0e49225dc174ab55d1d0b21e86208d7251/toolkit/mozapps/extensions/content/aboutaddons.html#200) to close the opened menu using an alternative way of the popup dismissal. For users of keyboards and assistive technology another way like pressing `Esc` key is available to dismiss the menu, thus we need to add an exception from the a11y_checks for this tests via `setEnv` and remove the `fail-if` notation from its test manifest.
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The `browser_menu_button_accessibility.js` sends [a click on a non-interactive spacer element](https://searchfox.org/mozilla-central/rev/1e726a0e49225dc174ab55d1d0b21e86208d7251/toolkit/mozapps/extensions/content/aboutaddons.html#200) to close the opened menu using an alternative way of the popup dismissal. For users of keyboards and assistive technology another way like pressing `Esc` key is available to dismiss the menu, thus we need to add an exception from the a11y_checks for this tests via `setEnv`