Well, it seems like I’m able to all the things that I wanted with firefox. Not sure what has happened but I have tested Firefox and other browsers actively and none of them weren’t earlier working the way I needed. Either something has happened in last 4 months in Firefox or then I’m just basically doing very lousy testing. I believe it’s the latter one. 
Now I’m able to open other dashboard links as modal which is kind of cool and all the other external hyperlinks opens in new window. Chrome can’t do this and I did not find extension for it. Firefox has this option and it’s working great. Thanks @josh !!
EDIT: only thing that I’m missing anymore is sharptools dashboard refresh automatically after pc wakes up. For some reason Chrome works normally and it refreshes the whole dashboard. Firefox seems to leave news, calendar and camera tiles without refresh. Camera feeds can be set to refresh from the Sharptools side but news or calendar tiles cannot. Now I’m trying to find addon which refreshes webpage on startup. I found a lot of autorefresh addons but they refresh webpage in ever xx period.