To update the plugin you must first follow a few steps:
Go to the plugin settings. You can find these by clicking on the puzzle piece (top right, next to the URL bar).
Then go to the plugin and click on the 3 dots (next to the name of the plugin).
Then click on 'Manage extensions'.
4. When you click on manage extensions, a new window will appear with all the details of the plugin. At the top right there is a button called "Developer Mode". You have to enable this once. When you have done this, a bar will appear.
5. When you have followed all the steps and the bar appears, you can click on 'Update'. You can also see which version you have here. This changes when an update is made available and you clicked on the 'Update' button.