Great job. I was looking for this since no other addon is a webextension. Just one question though, but let's take it to the support page:

https://github.com/NumeriusNegidius/Context-Search/issues/1

combo from 2 legacy add on add to search bar and context search (legacy)

This addon works great. I was hoping that some kind developer would make this extension for WE. A great big thank you for making the transition to WE much easier. I use the ability to search stores and anywhere else I wish several times a day.