If Firefox is already running and the user clicks on "Log My Find", the page opens in Firefox but does not come to the front. If the browser is closed, then it comes to the front as expected.
Turns out to be a Firefox problem.
To fix, open Firefox, click on Edit->Preferences, then click on "Tabs". Check the box beside "When I open a link in a new tab, show it immediately".
You seem to have CSS turned off.
Please don't fill out this field.