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Asked: 2026-05-28T15:54:31+00:00

How can I get the installed version of my Firefox extension, e.g. to show

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How can I get the installed version of my Firefox extension, e.g. to show it in the About dialog?

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1 Answer

  1. Editorial Team

    You use the AddonManager API:

    Components.utils.import("resource://gre/modules/AddonManager.jsm");
AddonManager.getAddonByID("id@my.addon", function(addon)
{
  alert("Installed version is " + addon.version);
});

    Here id@my.addon needs to be replaced by the ID of your add-on of course.

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