Webext Store Helper per Carlos Jeurissen

This extension adds some css to make publishing webextensions to other stores easier.

For whale, it scales down the banner to download whale. In addition, it allows drag/drop of an updated version during for an update.

For chrome, it decreases padding, changes the bg of items to white. and adds the publisher and account toggles fixed to the top right corner.

For opera, it adds a maxheight and scrollbar for the notifications area as there can be a lot. A scrollbar is added to the language list as well to make it easier to make changes to languages.

For Edge, it expands all items on the left so you don't need to expand them yourself, saving a few clicks.