Finally a working version. Perfect - thank you :-)

I thought this had disappeared years ago so I wasn't expecting to find a working version. Perfect - thank you.

Does exactly what it says it will. Works right out of the box. Could not be simpler.

i like that extrension especially choosin custom colors for visited links and exeptions :)

Works as described. Ability to do all links, some links or one link on a page is great. Allows me to update links on pages with file lists of 10's of links every month.

Works as intended. Thanks for creating this.

!!! EXCELLENT !!!
Works very well (except when wanting to mark all links as unvisited).

For those who have problems, check the about:config page if the line:
"layout.css.visited_links_enabled"
is set to true. If not, change it.
---
MESSAGE TO THE DEVELOPER
I don't understand this part:
"Preferences are stored in the browsers local storage unless the browser sync storage is enabled for web extensions.
To enable browser sync storage set webextensions.storage.sync.enabled to true in about:config"

Why do we need to enable: "webextensions.storage.sync.enabled" to true?? If I we don't do it then what??

this is truly awesome. didn't think there is a smart WE in matter of link marking.
small tips:
→suggest in prefs that color value is hex
→let us hide it from right click menu
→stay awesome

Yep, "Mark all links as unvisited" quit working with FF 56.0.2. Otherwise, for me it remains a very useful add-on.