Jack Campin said ....
"Facebook has managed to make it impossible for me to copy text from posts made there.

I presume there's a workaround, but saving the page source doesn't work for me either (somehow they have buggered things up so you can't save what you're reading in a form any other software can make sense of).

Ideas? I'm using Safari on MacOS 10.4.11, if that makes a difference."
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I'm using Mac OS Sierra 10.12.6 and my browser is Safari 11.0 (12604.1.38.1.7)

Whilst I don't make much use of Facebook I have just checked and there is no problem for me. I can highlight text in a face book post, COPY it & PASTE it directly into the message box.

No work around or alternative browser required.

As for the problems with losing the bookmarks.

You're using a Mac, can you go into the TIME MACHINE to recover them?? or otherwise return to a situation before the troublesome browsers were installed??

Jake