Add-on pages not displayed with Firefox

I can no longer display add-on pages with Firefox (125.0.3 on macos). For example, https://ankiweb.net/shared/info/1771074083 gives me “Error: Internal Error”.

When I go to the add-ons start page https://ankiweb.net/shared/addons and mouseover one of the links I see errors in the JavaScript console:

Error: cant skip wire type 4
    Immutable 17
        skip
        readMessage
        fromBinary
        fromBinary
        W
        ar
        Rt
        de
        async*Rt/he/$<
        he
        Le
        r
        e
        setTimeout handler*Rt/Ye/<
        Ye
        _start_router
        Ot
    <anonymous> https://ankiweb.net/shared/addons:33
    promise callback* https://ankiweb.net/shared/addons:32
app.f0c537c0.mjs:1:25670

That does not happen with Chrome (124.0.6367.208 on macos).

I am logged in with both Firefox and Chrome. Can I aid in debugging the issue?

The site is working for me in Firefox 126.0.
image

Have you tried the usual suspects – clearing cache and cookies for the site, using a “private” window, updating your browser, turning off scripts, etc.?

It works in a private window. So I guess that deleting the cookies would work, too. I didn’t do it because I thought I could help debugging the problem. The error message is pretty specific.

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Deleting cookies probably won’t help. It may be one of your browser add-ons.

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I tried to debug it but I couldn’t find the root cause. Deleting the cookies helps, though.

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