SSL certificate not fully recognized
My webite https://www.tanzaniabirds.net/alphabetical1.htm#gsc.tab=0 has an SSL certificate. The website shows as secure on Edge, Chrome and Safari but not on Firefox. The message on the Firefox secure symbol says parts of the page such as photos are not secure. This website is practically all photos taken by me and friends. What can be done to make it show as secure on Firefox? Thanks.
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In your header you have the line `<link rel="SHORTCUT ICON" href="http://www.tanzaniabirds.net/favicon.ico">`, telling Firefox to load the favicon via http. Firefox detects these kind of http subresources on a https site as "mixed content" and warns the user about them. You can read more about that here. The easiest solution would be to just update all subresources on your site to use https. Alternatively, you can also instruct Firefox to automatically "upgrade" those subresources to https through the upgrade-insecure-requests content security policy.
The favicon.ico href needs to be changed to "https".