zipBoard

zipBoard lets you take screenshots, annotate & collaborate on web pages and e-learning courses for a visual bug tracking experience. You have to sign up for zipBoard at www.zipboard.co and it automatically prompts you to download this extension.
This extension lets you take screenshots of your pages and allow creating bugs with annotated images when used inside zipBoard.
You can also use it for responsive testing. It lets you view your webpage in different resolutions and accordingly file bugs. zipBoard integrates with JIRA & slack so that you can include it in your current bug tracking and or collaboration workflow.