From August 26th, 2020 to March 16th, 2021, 100% user give 1-star rating. for GitHub-Jira Link chrome extension.
I tried this out as well, it doesn't work.
It worked for a while, but it doesn't show a button to JIRA ticket. There is some error in the console that prevents it to be rendered. I've submitted an issue more than two weeks ago - no answer. TL;DR: This doesn't work, don't download it.