![]() Firefox does not allow adding a Google Analytics tracking code to track your extension. However, Firefox requires less images and isn't as strict about the sizing as Chrome. ![]() Then, you will get to enter almost the same information as for Chrome regarding the name, description, etc. When uploading your extension on Firefox, you will be asked first to enter a few information regarding remote code execution, privacy and other security information as well. Once you are done, the review process can take some time before your extension is published on the Chrome Webstore. You also can enter a Google Analytics code that helps you track your extension and its users more thoroughly. You will also be required to enter a few details regarding privacy and handling user data based on the permissions you're asking for in manifest.json. When uploading your extension on Chrome, you will be asked to enter a lot of information regarding the name of the extension, description, a variety of images in different sizes, and other information that the user will see when downloading your extension. Once you have a developer account on both platforms, you can upload your extension. With Firefox, you don't need to pay anything to publish an extension. Once you do, you don't need to make any additional payments when adding more extensions. When it comes to publishing your extension, Google requires a one time fee of $25 (at the time of writing this) to create a developer account. Here's an example of how a Chrome extension package structure would look like: Whereas in Firefox the extension should be encapsulated in a directory that contains manifest.json at the root of it. ![]() When packaging the extension to publish it, in Chrome the manifest.json file should be in the root of the package. Packaging and Publishing Extensions Experience Chrome allows passing relative URLs when making a request (for example, /user), however, Firefox requires absolute URLs.Firefox does not allow functions like alert, confirm or prompt in background scripts.URLs in CSS files in Firefox are resolved relative to the CSS file, whereas in Chrome they're resolved relative to the current page.The declarativeContent API that Chrome has is not yet implemented in Firefox.tabs.query is not allowed in Firefox without the tabs permission in the manifest.json but it's allowed in Chrome if the tab matches the host permissions in manifest.json.To resolve this, use (or replace chrome with browser for Firefox) to get the fully-qualified URL for a file in the extension. For the tabs API in the functions insertCSS and executeScript, Firefox resolves the URLs being passed relative to the current page, whereas Chrome resolves the URLs being passed as relative to the root of the extension.Chrome states in their chrome.notifications API documentation that for the parameter iconUrl is required, whereas for Firefox it's optional.Some functions have different signatures or behavior for each of the browsers: Mozilla, however, offers a polyfill that allows you to use Promises in all browser extensions. then ((tabs) => console.log(tabs.title)) Here's an example of how you'd query tabs in Chrome: Callbacks will continue to be supported as well. Update: With the release of MV3, more and more APIs in Chrome now support Promises, with full support coming soon. The main difference between the two, however, is that chrome.* only supports callbacks when handling asynchronous events, whereas browser.* supports both callbacks and promises. Firefox claims that it supports chrome.*, but it's preferred to use browser.*. In Chrome, the API namespace is chrome.*, whereas for Firefox it's browser.*. Suggested Read: Learn how to migrate your Chrome extension from Manifest V2 to V3! Mozilla is intending to keep a lot of functions and APIs that Chrome is discarding in V3. As for Firefox in a blog post in 2019, Mozilla indicated that they will also support Manifest V3, however, they're not obligated to implement every part of it. "browser_specific_settings" : Manifest V3Ĭurrently, Chrome is pushing towards using Manifest V3 which has been controversial for a few reasons.
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