Deploy Bowser Extension for Opera

I am using the Keybase Chrome Extension without Problems in Opera.
This is because Opera is based on Chromium which makes it very compatible with all Chrome Extensions.
You should officially support Opera since you just need to re-compress the Extension and deploy it on the Opera Market so it can be installed without Warnings.

Start by locating the existing Chrome extension packaging and deployment process, then check the requirements for publishing it in the Opera Market. Done means the extension is officially available for Opera installation without browser warnings.

Written by the indexing model from the issue text.