[docs] Demo BasicModal crashes about material-ui HOT 8 CLOSED

Crazy thing: it looks like the culprit is the Proton Pass extension on Firefox. When I disable it, everything works fine again.
Could you confirm you have this extension as well @harley-codes?

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I have the exact same issue - dialogs and dropdowns crashing exclusively on Firefox - and I also use Proton Pass extension. The person who reported the issue on my website has the same setup. It stopped happening for both of us once we disabled the extension, so @michaelperrin you're definitely onto something!

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I think we can close this right @Arcyvilk? What do you think... I don't see MUI jumping in to solve their bug, not their fault.

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@harley-codes I agree. Maybe we could raise it with Proton team instead 🙂

EDIT: It looks like they are aware of the bug and are working on it! https://www.reddit.com/r/ProtonPass/comments/1bfe2zi/protonpass_firefox_addon_breaks_websites/

Good catch and good to know that the Proton team is aware of it!
I couldn't believe it when I found out all the issues were related to that extension 😅

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It's really weird, all dialogs stopped working on my project, and demos on official docs as well (same error as yours).
However, it seems to only affect Firefox, as it is working on Chrome.

Here is the error I get in dev mode:

Uncaught Error: Permission denied to access property "getAttribute"

and:

Uncaught TypeError: containerInfo is undefined

I tried to downgrade the version of MUI, and still have the issue.
Could this be an issue with a Firefox update?

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@michaelperrin, and @Arcyvilk you both seem to be onto something. I also have Proton Pass. I forgot that I chose not to disable this one, thinking that it would have no affect.

Hmm... Wonder if the extension used NextJS under the hood, and there seems to be a conflict in the library that effects MUI.

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Disabling Proton Pass' autocompletion on the affected website removes this issue. Makes me think it recognizes MUI component as one to use autocomplete on and fails.

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@harley-codes I agree. Maybe we could raise it with Proton team instead 🙂

EDIT: It looks like they are aware of the bug and are working on it! https://www.reddit.com/r/ProtonPass/comments/1bfe2zi/protonpass_firefox_addon_breaks_websites/

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