I have a Chrome+Mozilla web extension, Requestly . I load two content scripts for a particular page with the following declaration in manifest "content_scripts": [ { "matches": [ "*://requestly.in/rules/*" ], "css": [ "generated/pages/css/main.css" ], "js": [ "generated/pages/j…

As far as I know, there is no guarantee of the order in which scripts will be loaded. You may need to rely on the load event or a timeout to make sure both scripts have been loaded.

https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/content_scripts says that they are injected in the order specified, and gives an example.

In that case, it must be a bug. Adding @wbamberg to confirm that part of the documentation matches the implementation.

Chrome docs: https://developer.chrome.com/extensions/content_scripts#js Unless this is an intentional incompatibility with Chrome behavior, then the docs are correct and this is a Firefox bug.

@wbamberg @jorgev One more thing, the same scripts work in Chrome stable as well as Canary version So I strongly believe this is a Firefox bug. Also, Instead of using timeouts or load event, I’d prefer to concatenate them in order and avoid this situation. Due to this, my extension is broken on Fi…

Thanks @jorgev . I have logged a bug here: https://bugzilla.mozilla.org/show_bug.cgi?id=1347700

Order of execution of content scripts in Mozilla web extension

Add-ons addons.mozilla.org

jorgev March 15, 2017, 8:28pm 7

It sounds like a Firefox bug. Can you please file it here: https://bugzilla.mozilla.org/enter_bug.cgi?product=Toolkit&component=WebExtensions:Untriaged

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Order of execution of content scripts in Mozilla web extension

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