nospam wrote, on Fri, 04 Dec 2015 21:56:21 -0500:

it's not your fault. lots of web sites do that.

I found a way around that stupid Facebook popup!

1. Visit that page in Firefox:
https://www.touchofmodern.com/sales/.../smart-adapter

2. Notice the unremovable popup to create a Facebook account or log in.
https://i.imgur.com/jV63Aaf.jpg

3. Type "about:config" into the URL field of Firefox:
Then type "javascript.enabled".

Toggle from:
javascript.enabled;true
Toggle to:
javascript.enabled;false

4. Press the reload button in Firefox.
Voila!