I'm pretty sure it's a FF/Dexpot issue, because this happens to me no matter what program I click on links from.

Can't offer any help, but moral support I have the exact same problem. Not sure who is the culprit: outlook, FF, or dexpot. I have had to disable the rule.

I have Firefox on Desktop 1, and Outlook on Desktop 2. When I click on a web link in Outlook, it causes the Firefox window to appear also in Desktop 2. So, I created a rule to move Firefox windows to desktop 1, with follow enabled (just like in the English DexWiki article). But it doesn't work correctly. It does take me to Desktop 1, but it doesn't remove Firefox from Desktop 2. Then to further complicate things, while this rule is active, I can't get to the system menu of the Firefox window on Desktop 2 - it immediately switches me to Desktop 1, so that any action I perform from the system menu acts on the Firefox window on Desktop 1. I have to deactivate or delete the Firefox rule in order to remove the Firefox window from Desktop 2.