CODEWITHSUNDEEP
javascriptfirefoxfirefox-addon-webextensionsbrowser-addons
Erik Johansson
Erik Johansson

Reputation: 63

Create an unmodified object in a Firefox addon using WebExtensions

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.

Upvotes: 0

Views: 41

Answers (1)

Erik Johansson
Erik Johansson

Reputation: 63

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

Upvotes: 0

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