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Editorial Team
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Asked: 2026-05-23T11:35:26+00:00

I submitted my addon to the firefox amo directory and it got reviewed and

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I submitted my addon to the firefox amo directory and it got reviewed and passed, but the reviewer sent me this message:

2) The following error appears in the Error Console. It’s fairly easy to
fix.

Error: gBrowser.addProgressListener
was called with a second argument,
which is not supported. See bug
608628. Source File: chrome://browser/content/tabbrowser.xml
Line: 1840

The thing is I have nver touched chrome://browser/content/tabbrowser.xml and dont even know where to find it… so how do I fix this problem?

Thanks!

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1 Answer

  1. Editorial Team

    Sounds like you are calling addProgressListener() somewhere in your code with multiple arguments. It is a single argument function – you can find the documentation here:

    https://developer.mozilla.org/en/XUL/tabbrowser#m-addProgressListener

    The location chrome://browser/content/tabbrowser.xml is where the function is defined, and line 1840 is the location in the file where the “don’t call this function with more than one argument” error is thrown. You can find the file in a check out of the FF source at (I think) browser/base/content/tabbrowser.xml, but you probably don’t need to examine it in this case.

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