IMPORTANT Security Information Rated 5 out of 5 stars
Google has issued a Safe Browsing Advisory for the top level domain hosting phproxy.org (ok.pe).
IMO this DOES NOT REFLECT ON on UrlbarExt or necessarily on phproxy.org. Just a heads up for the developer and fellow users.
UrlbarExt provides useful features, is highly/easily configurable and has worked flawlessly without interfering with Firefox and/other extensions (100+ installed).