[Affected versions]:

• 115.0.2 (64-bit)

[Affected platforms]:

• Mac 13.3.1 (22E261)

[Steps to reproduce]:

1. Launch Firefox
2. Open a random *.pdf file (e.g. https://www.africau.edu/images/default/sample.pdf)
3. Click the "Switch to Presentation Mode" button
4. Right click in the document
5. Observe the "Select All" context menu option.

[Expected result]:

• The "Select All" context menu option is greyed out.

[Actual result]:

• The "Select All" context menu option is still clickable but nothing happens.

[See Also]:

• From https://bugzilla.mozilla.org/show_bug.cgi?id=1267592#c4, if text selection is purposely disabled in Presentation Mode, since it's intended for reading/showing presentations, then the option should be greyed out instead of being clickable.

:buglinking, if you think that's a regression, could you try to find a regression range using for example mozregression?

Hello, thank you for the bug report!
Managed to reproduce this issue on:

• Nightly 118.0a1;
• Beta 117.0b2;
• Firefox 116.0;

Tested and reproduced on:

• Windows 10;
• macOS 12;
• Ubuntu 22;

Setting as NEW so the developing team can have a look.

There is an r+ patch which didn't land and no activity in this bug for 2 weeks.
:calixte, could you have a look please?
If you still have some work to do, you can add an action "Plan Changes" in Phabricator.
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