Exception while firefox startup

[Mirraz]

While startup Firefox-41.0.2 prints in console: 1445590359012 addons.xpi WARN Exception running bootstrap method startup on [email protected]: TypeError: preferences.setStringPref is not a function (resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///home/user/.mozilla/firefox/uu9mytgh.default/extensions/[email protected]!/bootstrap.js:123:4) JS Stack trace: c.prototype.enable@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///home/user/.mozilla/firefox/uu9mytgh.default/extensions/[email protected]:123:4 < c.prototype.start@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///home/user/.mozilla/firefox/uu9mytgh.default/extensions/[email protected]:153:3 < startup@resource://gre/modules/addons/XPIProvider.jsm -> jar:file:///home/user/.mozilla/firefox/uu9mytgh.default/extensions/[email protected]:173:2 < [email protected]:4657:9 < [email protected]:2376:13 < [email protected]:221:12 < [email protected]:828:5 < [email protected]:999:9 < [email protected]:2672:5 < [email protected]:58:7