When I open Gmail in Firefox, the secure (padlock) icon appears only for a few seconds; the connection then recycles and goes to the triangle alert icon.
When I open or refresh Gmail in Firefox, the secure padlock icon appears at first, but within a few seconds the connection then refreshes itself without me opening anything or moving the mouse. The secure icon is then replaced by the alert triangle, which displays a message when I hover over it saying "This website does not supply identity information." I have already changed the Images setting to Ask Before Displaying External Images, but it had no effect on this behavior. This same change happens on other secure websites, but not as consistently it does on Gmail.
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You have two old Shockwave Flash programs. Remove both. Then update your Shockwave Flash.http://get.adobe.com/shockwave/
If there is mixed passive content (e.g. images) then Firefox shows an exclamation mark instead of "Site Identity Button" (globe/padlock) on the location bar.
You can open the Web Console (Firefox/Tools > Web Developer) and search for lines with [mixed] to see if that allows to identify the mixed content.
I found only one old Shockwave program, removed it, updated, but it had no effect. Out of curiosity, I also disabled Shockwave plugins, but that didn't do anything, either.