A triangle with an exclamation mark means that there is mixed content on a secure HTTPS page that comes via an open HTTP connection.

You can check what content is causing this in the Web Console (Firefox/Tools > Web Developer) by searching for mixed. Such lines are red text. If necessary the reload the page (F5 or Ctrl+F5 to bypass the cache).

• https://developer.mozilla.org/Security/MixedContent
• https://support.mozilla.org/kb/how-does-content-isnt-secure-affect-my-safety

thanks res cor-el Mixed Content red line is not found on web console. gmail and google+ are all https. is not mixed with http. Does this happen in https(s)?

This problem arises only opening Google+ with Gmail. It doesn't arise in other Google products with Gmail.

I found out Mixed Content hiding in frame content on Google+.

As long as I see, it seems that Firefox30.0 will not block.

In my firefox about:config security.mixed_content.block_active_content = true (default) security.mixed_content.block_display_content = false (default) ... even true

I need to block the Mixed Content. But, no information. If someone knows the information sources about it, I want to know its place.

Please teach me.

Thank you

What is the nature of that mixed content?

Are that image or plugin content or otherwise?

#1
03:52:05.339 Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead rs=AItRSTNjhiofhqwdH2B7P5W-Fe4130MwbQ:46

#2
03:52:05.916 The character encoding of a framed document was not declared. The document may appear different if viewed without the document framing it. transportevents

#3
03:52:08.756 Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead rs=AItRSTOkTTBoASTrIV_evk6V34knYtDqZw:1071

HTTPS broken at #3. Firefox ran with safemode and disconnected sync. I can't see mixed contents. Is this issue that Google+ has caused? I try to downgrade firefox to 28.0 for this testing. Thanks