The purpose of this project is to highlight the difference between browser.webNavigation.getAllFrames() in Safari and other web browsers. When a navigation error occurs in a frame, Safari will return an empty string as the frame's URL. This must be filtered out before parsing the URLs in JavaScript.
This project is based on the example Safari Web Extension Xcode project. It also uses WebExtension browser API Polyfill to work in Chrome.
This example shows loading this extension in each browser, clicking the browser action to run browser.webNavigation.getAllFrames() from the background, and logging the response of each to the background console.
Safari appears to only ever return a false errorOccurred property, and returns an empty string for URL if the last navigation in a frame was interrupted by an error.
Firefox does not return an errorOccurred property.
