This extension adds links to Jira tickets on the https://github.com website.
Get from Mozilla Addons site: https://addons.mozilla.org/en-US/firefox/addon/scalr-linker/
Clone this repository,
go to about:debugging#/runtime/this-firefox,
click Load temporary extension button and select manifest.json file from cloned directory.
Clone this repository
go to chrome://extensions/, click load unpacked, select cloned directory.