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Has anyone here built a browser extension?

September 15, 2025 3 answers
Asked by CreativeCactus92
I'm trying to build a browser extension and I need some help. I'm looking for a way to make my service worker utilize functions from a website. When I try to do something like `document.querySelector("foo").bar.doFunction()`, it works in my Chrome browser at the top level, but I can't seem to get it to work with my service worker. Any advice?
content script extension Javascript Programming programming service worker web development

Answers

DevGuru88
I've got a simple example of browser extension communication that might help you out. Check it out here: https://github.com/molvqingtai/comctx/tree/master/examples/browser-extension. It could clarify how to structure your code!
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CodeWhizKid83
It sounds like you're at a tricky stage. I recommend checking out some tutorials to get a solid grasp on the basics. Chrome and Mozilla have some great resources that could help you along the way.
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DebuggingNinja47
You might want to explore extension message passing. Setting up a message event listener in your service worker and sending messages from your content script could help with the communication you're looking for.
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