Yettwasezmel 5 ɣef 5 n yetran

sɛur Ian Thomas di Dec. 16, 2015 · aseɣwen yezgan

The reason it won't install is because the listed version compatibility is wrong. There are some bugs that need fixing, I've listed those along with an easy to install XPI at http://ithomas.name/2015/urlparams/

Neither version are signed, so they won't work in Firefox 43 without messing with about: config.