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Asked: 2026-06-13T20:19:40+00:00

I am having trouble following the explanation here about receiving startup notifications in a

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I am having trouble following the explanation here about receiving startup notifications in a Firefox extension. It says there to add 

category profile-after-change MyComponent @foobar/mycomponent;1

to chrome.manifest. What do I put for MyComponent and foobar/mycomponent;1?

My extension is actually a plugin for another extension. In its main .js file, I have 

MainExtension.MyPlugin = {...

and then define all of my functions inside of my MyPlugin object property of the MainExtension’s object.

I believe that I should set MyComponent to MainExtension.MyPlugin. I am not sure about the second part. I am also not sure what I need to do to call the function that I want called on start up. Looking at some other extensions, I think I might need to add an observe() method to MainExtension.MyPlugin that calls another function when it receives a profile-after-change notification, but I am not sure.

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1 Answer

  1. Editorial Team

    As Wladimir Palant noted in a comment to the question, to use the profile-after-change notification you have to have an XPCOM component. Then MyComponent is the class that component creates and @foobar/mycomponent;1 is the component’s contract id. I didn’t know what these were because my extension simply overlays another extension that defines an XPCOM component. My extension doesn’t have its own XPCOM component.

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