1. Feature to resolve country code from IPaddress using WebAPI
2. Fixes for IndexedDB. Added processing when rollback is detected, etc.
3. Added processing to destroy IndexedDB instances when closing Thunderbird
　and upgrading add-ons
4, Fixed a table button misalignment issue that occurred in the options screen when
　a country code was added in Thunderbird 138 with the US language code.

The following are the changes in version 1.4
　
 [Functionality Improvement] :

 1, Fraudulent emails are now sorted into trash and quarantine folders
   per email account in Thunderbird when multiple accounts are
  registered. This addresses issues where sender addresses would
  change when replying to false positives.
　
 2, An "Empty Folder" option has been added to the right-click context
   menu of the quarantine folder.

 3, Added an exception setting in the options screen that performs
   only a minimal spoofing check for specific domains.

 [Specification Improvement]:

 1, By adding a session feature, we've achieved a significant speed
   improvement in the fraudulent email detection process.

 2, Other inefficient processing optimizations.

 [Bug Fix]:

 1, Add-on initialization fails when no country codes are set to be
  excluded.

 2, Fixed patterns where fraudulent email checks were unintentionally
  bypassed.

The bug in the previous version regarding deleting scam emails has been fixed.

Sorry.. This version has a problem with the deletion process.