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Editorial Team
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Asked: 2026-06-07T09:33:57+00:00

I’ve seen numerous references to browser.js while trying to create a Firefox sidebar. I

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I’ve seen numerous references to browser.js while trying to create a Firefox sidebar. I don’t have a good understanding of what this file is though. It has a method toggleSidebar in it. Can I call that method from a web page? Can I call it from a browser extension? Do I need to include browser.js in my extension somehow first? Can I call it from the add-on SDK or is it only available from the old style XUL extensions?

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  1. Editorial Team

    I don’t have a good understanding of what this file is though.

    It is the code driving the Firefox browser window, lots of code actually.

    Can I call that method from a web page?

    No. You can use window.sidebar.addPanel() to add a sidebar however.

    Can I call it from a browser extension?

    Yes.

    Do I need to include browser.js in my extension somehow first?

    No, it is already included in the browser window.

    Can I call it from the add-on SDK or is it only available from the old style XUL extensions?

    You can use it from the Add-on SDK as well but you will need to access the browser window directly – either via one of the low-level modules or chrome authority.

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