Water was used to process them, and if you get them wet again, they will turn loose, after which you can dry them out again. I don't know how the frame will be about the water, but you may want to try it by putting a damp paper towel on the backs of the photos for a while to see if they turn loose.
If someone has better ideas, I would weigh the options before trying to get the photos off the glass. Someone has been thru this, and knows the best way to get it done.
I would definitely try to photograph them thru the glass before doing anything more, so as to just have a safety copy.
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