- trekkie
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- Exalted Legendary Member
- gamertag: [none]
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If it annoys you it can be disabled by pasting about:config in your address bar and searching for "security.warn_viewing_mixed", and double clicking on the same.
It's slightly more secure to leave it on so you don't accidently enter your password in a counterfit site.
Should you choose to disable this feature it is imperative that you do not touch anything else in about:config, at least without making sure you know what will happen.