UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce the problem:
1. In a notepad program (e.g. Notepad++), type three URLs, pressing Enter after each item.
2. Copy them to the clipboard.
3. Open the Bookmark Manager.
4. Paste.

What is the expected behavior?
Each URL on the clipboard appears in the Bookmark Manager as its own bookmark entry.

What went wrong?
One entry is created, which is a concatenated string of all three URLs.

Did this work before? No 

Chrome version: 70.0.3538.110 (Official Build) (64-bit)   Channel: stable
OS Version: 10.0
Flash Version: Shockwave Flash 31.0 r0

I do not know this for sure, but #106329 seems related or similar in its behavior.

The expected behavior is also the current behavior in Firefox.

The behavior does not seem affected by what manner of line ending is used (CR-LF, CR, or LF).