You can easily your own extensions in Chrome by clicking the "Load unpacked extension" which can be just a folder from your computer that has a manifest.json fi

You can easily your own extensions in Chrome by clicking the "Load unpacked extension" which can be just a folder from your computer that has a manifest.json file in. You can also easily inspect the extensions that you have installed with the chrome developer tools, ie. copy them and fix them if needed. If anything, I'd say my experience between the Chrome and Firefox extensions are completely opposite to yours. For one, Firefox has some 1-3 different extension types/apis, so you have first understand which one to use from their convoluted developer docs. Secondly, when you submit the extension, some volunteer "reviews" it whenever they have the time, which can take days to weeks. Once I got feedback and got rejected because there was a typo in the extension. With Chrome it's very easy to create an extension, you basically only need that manifest.json file and then you can submit it to the store and it's online less than an hour.