$firefox

1487125970561   addons.xpi  WARN    Failed to add directory install location app-profile: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIFile.isFile]"  nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)"  location: "JS frame :: resource://gre/modules/addons/XPIProvider.jsm :: DirectoryInstallLocation.prototype._readAddons :: line 7447"  data: no] Stack trace:DirectoryInstallLocation.prototype._readAddons()@resource://gre/modules/addons/XPIProvider.jsm:7447 < DirectoryInstallLocation()@resource://gre/modules/addons/XPIProvider.jsm:7379 < MutableDirectoryInstallLocation()@resource://gre/modules/addons/XPIProvider.jsm:7545 < addDirectoryInstallLocation()@resource://gre/modules/addons/XPIProvider.jsm:2508 < this.XPIProvider.startup()@resource://gre/modules/addons/XPIProvider.jsm:2582 < callProvider()@resource://gre/modules/AddonManager.jsm:227 < _startProvider()@resource://gre/modules/AddonManager.jsm:833 < AddonManagerInternal.startup()@resource://gre/modules/AddonManager.jsm:1016 < this.AddonManagerPrivate.startup()@resource://gre/modules/AddonManager.jsm:2782 < amManager.prototype.observe()@resource://gre/components/addonManager.js:58

=== ESMTP Postfix
=== Error: Command not recognized
=== Error: Command not recognized

1487125970561   addons.productaddons WARN failed to download XML, status:0 reason: error

Fire fox -v Mozilla FireFox 45.0.1
Chatzilla Version 0.9.93
RHEL 6.3