I have issue with my profile. I can't backup it. The performance of thunderbird is very slow. Usualy it takes one hour to become operational. I think problem is related to import of profile. I have imported profile from other computer and that profile never worked 100%. On other computer that profile is working without any problem. Thanks for your help! Bellow is error console: 1738312102395 addons.xpi WARN Error parsing extensions state: [Exception... "Component returned failure code: 0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [amIAddonManagerStartup.readStartupData]" nsresult: "0x80520015 (NS_ERROR_FILE_ACCESS_DENIED)" location: "JS frame :: resource://gre/modules/addons/XPIProvider.sys.mjs :: loadExtensionState :: line 1395" data: no] Stack trace: loadExtensionState()@resource://gre/modules/addons/XPIProvider.sys.mjs:1395 scanForChanges()@resource://gre/modules/addons/XPIProvider.sys.mjs:1431 checkForChanges()@resource://gre/modules/addons/XPIProvider.sys.mjs:3058 startup()@resource://gre/modules/addons/XPIProvider.sys.mjs:2527 callProvider()@resource://gre/modules/AddonManager.sys.mjs:226 _startProvider()@resource://gre/modules/AddonManager.sys.mjs:535 startup()@resource://gre/modules/AddonManager.sys.mjs:748 startup()@resource://gre/modules/AddonManager.sys.mjs:3645 observe()@resource://gre/modules/amManager.sys.mjs:73 1738312102399 addons.xpi WARN Checking C:\Program Files\Mozilla Thunderbird\distribution\extensions for addons 1738312106462 addons.xpi WARN Addon with ID default-theme@mozilla.org already installed, older version will be disabled 1738312106463 addons.xpi WARN Addon with ID thunderbird-compact-dark@mozilla.org already installed, older version will be disabled 1738312106463 addons.xpi WARN Addon with ID thunderbird-compact-light@mozilla.org already installed, older version will be disabled