Given a relative path from the manifest.json to a resource packaged with the extension, return a fully-qualified URL.
browser.runtime.getURL( path // string )
string. A relative path from the manifest.json to a resource packaged with the extension.
string. The fully-qualified URL to the resource.
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Given a file packaged with the extension at "beasts/frog.html", get the full URL like this:
var fullURL = browser.runtime.getURL("beasts/frog.html"); console.log(fullURL); // Returns something like: // moz-extension://2c127fa4-62c7-7e4f-90e5-472b45eecfdc/beasts/frog.html