All of a sudden after months of working properly, I am unable to open hotlinks from within Outlook using my default browser Firefox. If I change Chrome to be the default browser (using Chrome settings), then clicking links opens a new tab in Chrome. If I change Firefox back to default browser, clicking links doesn't work anymore.
If I click that blue mozilla link in the image above, nothing happens as well.
Event Log shows no warnings or messages anywhere.
I think somehow the internal path to firefox.exe is probably messed up?