That’s it! If you try reloading the extension now (as per part one), everything should go as expected and no warnings should be shown. Resources must be listed in the web_accessible_resources manifest key in order to be loaded by web pages.” To avoid this, we simply add the following content to our manifest file: 'web_accessible_resources' : Without it, our statusbar.html won’t load and will throw the error “Denying load of chrome-extension://…/statusbar.html. We now need to list all the resources we’ll be loading “on the side” in a web_accessible_resources key. The new version of the manifest, however, has some additional requirements. While we’re at it, let’s bump up the version value to 0.2. I added it immediately under the “version”. The directives in these files often change with new versions as the web develops and Google Chrome adds new developer features, so in order to keep our extension “marketable” on the Chrome Web Store, we need to add the following line anywhere in our manifest file: 'manifest_version' : 2, The manifest files, as previously mentioned, are files that describe to Chrome what an extension does, how it does it, and whether or not it should be allowed to do something. Let’s get started! Updating the Manifest FileĪs pointed out by Michael in the previous instalment’s comments section, and Mohamed Mansour in my Google+ post, Google is gradually phasing out support for manifest v1 files. In this part of the series, we’ll update the manifest file, add a page counter, add some precision to the word counter and last but not least completely remove jQuery and replace it with vanilla JavaScript. Now let’s have a look at how we can improve it slightly. While not very accurate, it was a decent and usable first version which served its original purpose well. Our extension detects when it’s in the context in which it should activate, and periodically runs that part of itself which helps it count the number of words in the document. In the previous instalment of this series we created a simple Google Chrome extension that adds a persistent word counter to your open Google Documents.

Hello, and welcome to Part 2 of our Build your own Chrome Extension tutorial!

Chrome addons word counter