I have a web-based app which I use firefox to open. I use multiple tabs like for opening and printing pdf & having multiple modules from the web-based app. The issue is some users are clicking on the firefox icon even though firefox is open & it opens another session or window of Firefox. What I would like if someone clicks on the Firefox icon and it is already open to just display that session of firefox that is open & not open a new window/session. My issue is we have 5 and 6 different windows for the same web app & it's causing some issues. All links should open in a new Tab which they do now but if I can find a way to stop firefox opening twice it will solve my issue.