My extension seems to be missing the content script I uploaded

I am currently developing an extension for Google Chrome.

My goal is to create a content script that can retrieve meta tags from the tab when the popup is clicked.

In my manifest, I have included the following permissions:

"content_scripts": [{
    "js": ["src/js/DOMReader.js"],
    "matches" : [
        "*://*/*",
        "http://*/*",
        "https://*/*"
    ]
}],
"permissions": [
    "unlimitedStorage",
    "storage",
    "notifications",
    "activeTab",
    "tabs",
    "bookmarks",
    "browsingData",
    "identity",
    "topSites",
    "history"
]

Every time I call the content script, it returns the default error value. When I try to locate it using the developer console sources tab, I cannot find my content scripts.

It is frustrating because I am unable to debug my code properly without being able to see the content script. I just want to understand why my content script is not visible and my searches have not provided any answers.

Answer №1

According to the documentation:

Content scripts run in a unique environment known as an isolated world. They can access the DOM of the page they are injected into, but not any JavaScript variables or functions created by the page. Each content script operates as if there is no other JavaScript running on the page it's operating on.

This implies that you won't be able to observe it on the same page being inspected by your developer tools. Instead, you must inject code into the specific webpage you wish to inspect. Learn more about this method described here (which includes additional information regarding content scripts).

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