ran CCleaner and still.......

CCleaner for Windows
1

Script: resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/WillCraig/AppData/Roaming/Mozilla/Firefox/Profiles/jst9q7nt.default-1421027600370/extensions/jid1-f7dnBeTj8ElpWQ@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/loader/sandbox.js -> resource://skype_ff_extension-at-jetpack/skype_ff_extension/data/mutation-summary.js:598

why doesn't CCleaner catch this ?

2

Script: resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///C:/Users/WillCraig/AppData/Roaming/Mozilla/Firefox/Profiles/jst9q7nt.default-1421027600370/extensions/jid1-f7dnBeTj8ElpWQ@jetpack.xpi!/bootstrap.js -> resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/loader/sandbox.js -> resource://skype_ff_extension-at-jetpack/skype_ff_extension/data/mutation-summary.js:431

still doing it after ~CCleaner......why isn't it working ?