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I'm building an addon that works on a page where the canvas element prototype has been modified, this means any new canvas element I create on the page or in the addon with have the same modified state.

Is there a way to get around this? I tried using eval() but it also uses the page "version" of the HTMLCanvasElement.

To get around it in the browser manually I can create an iframe and execute a script inside it that sets a variable on the parent window which I can then of course .call() with the context I want, the problem is that WebExtensions doesn't allow access to variables set by page scripts.

Erik Johansson
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1 Answers1

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After some more reading I found out that there's a property called wrappedJSObject that allows the content script to access properties set by the page script.

More information: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Content_scripts#Accessing_page_script_objects_from_content_scripts

Erik Johansson
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