A new version is available on Google Chrome Store and will be automatically upgraded to all the users. If you are a new user, you can download the Jira Server or Jira Cloud plugin here
The new version is for Jira Cloud (for extensions *.jira.com and *.atlassian.net) and Jira Server!!
The code has been cleaned and now is faster.
The columns in the Kanban boards are now transparent and the background picture is more visible!!