I came across a FireFox add-in called Save Text to File.
You can highlight a section or a whole page and then click a Save Text to File icon and it copies the selection to a text file.
It ignores images and copies only text.
It has options that allow the user to pick how and where the text is saved and how automated they want it to be.
A couple of examples:
Option to append to a specific file or to create individual files
Option to review or not review detailed info about the file before it's saved.
This is an example of what the output looks like.
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Date stamp: 2017-09-02
Time stamp: 19-06-56
posting.php?t=20967
See here is collection of some updated and accurate tools
http://www.citationmachine.net
http://www.bibme.org
http://www.researchomatic.com/
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It's simple but useful when you want to quickly grab pieces of info and not have to remember when and where you got it from.
Bill