Fix eBay listings

[ghostwords]

AMO review:

I have given a three star rating, because up until recently it was working perfectly. Now when searching ebay for potential purchases the item description left by the sellers seams to have disapeared. I only know it to be the fault of Privacy Badger through trial and error, Once dissabled, all the decriptions are now visible again. I will enable it again periodically to see wether this perticular glitch gets sorted out.
I have a feeling this may have started on 26th Oct.after the last update.

The problem seems to be ebaydesc.com subdomains getting caught because of various cookies, and subsequently blocked when seen across three or more eBay country code TLDs (related to #1253).

We got dozens of error reports for this too. Counts of blocked ebaydesc.com subdomains by month:

+---------+----------+
| ym      | COUNT(*) |
+---------+----------+
| 2017-10 |       27 |
| 2017-09 |       10 |
| 2017-08 |        5 |
| 2017-07 |        6 |
| 2017-06 |        8 |
| 2017-05 |        6 |
| 2017-04 |        7 |
| 2017-03 |        6 |
| 2017-02 |        9 |
| 2017-01 |       10 |
| 2016-12 |       10 |
| 2016-11 |        8 |
| 2016-10 |        1 |
| 2016-09 |        4 |
| 2016-08 |        2 |
| 2016-07 |        7 |
| 2016-06 |        1 |
| 2016-05 |        3 |
| 2016-04 |        1 |
| 2016-03 |        1 |
| 2016-02 |        3 |
| 2015-11 |        2 |
| 2015-10 |        3 |
| 2015-09 |        1 |
| 2015-08 |        4 |
+---------+----------+

As you can see, the issue seems to exist before the October 26th update. I do wonder why we are getting more reports of this problem now. Maybe something changed on eBay?

Also, are there any other ways to learn to block ebaydesc.com? It seems strange that so many people use eBay via three or more different country code domains. I don't see ebaydesc.com get blocked on any non-eBay FQDNs in error reports though.

[ghostwords]

Examples from error reports:

• https://www.ebay.com.au/itm/Hiace/232540625435
• http://www.ebay.ca/itm/Electronic-start-unit-Danfoss-101N0500-multivoltage-AC-DC-compressor-BD35F-BD50F-/162122633871
• https://www.ebay.com/itm/Dell-Venue-11-Pro-7130-10-8-i3-4020Y-4Gb-128Gb-SSD-Windows-10-Pro-Tablet-Black/352193940670