Fix https://github.com/DandelionSprout/adfilt/discussions/163#discussioncomment-1564242

uBO list extensions/clear_urls_uboified.txt

@@ -1,5 +1,6 @@
 ! Title: ClearURLs for uBo - List extension
 ! Homepage: https://github.com/DandelionSprout/adfilt/discussions/163
+! Last updated: 30/10/2021
 ! Note: This was forked from https://gist.github.com/rusty-snake/5cd83a87d680ecbd03e79a1a06758207, which is based off of https://github.com/ClearURLs/Rules. The maintainers of Adfilt (DandelionSprout and iam-py-test, and contributors) have made some modifications as to keep it up-to-date with the source and to fix issues
 
 $removeparam=/^p[fd]_rd_[a-z]*=/,domain=amazon.*
@@ -109,8 +110,6 @@ $removeparam=/^action_(?:object|type|ref)_map=/
 $removeparam=gs_l
 $removeparam=mkt_tok
 $removeparam=/^hmb_(?:campaign|medium|source)=/
-$removeparam=/^ref_?=/
-$removeparam=referrer
 $removeparam=gclid
 $removeparam=/^otm_[a-z_]*=/
 $removeparam=cmpid