SeaMonkey 2.53.15

What's new in this version:

- Microtasks and promises
- Implement queueMicrotask()bug 1480236.
- Remove old synchronous contentPrefService from the tree
- Remove remaining uses of 'general.useragent.locale'
- Migrate to intl.locale.requested.locale list from 'general.useragent.locale'
- Introduce a pref to store BCP47 locale list
- Remove synchronous certificate verification APIs from nsIX509CertDB
- Taskbar preview's favicon appears blank
- Call Imagelibs decodeImageAsyncWindows using a callback
- Remove PermissionsService from process Windows sandboxing code
- Security info dialog doesn't show cert status anymore
- Replace nsIPlatfromCharset in mailnews
- Replace use of nsMsgI18NFileSystemCharset() with NS_CopyUnicodeToNative/NS_CopyNativeToUnicode()
- Cater for Outlook's/Hotmail's 'Deleted' folder
- Make some filter methods scriptable
- Fix crash in nsMsgFilterAfterTheFact::ApplyFilter() caused by async reset of 'm_curFolder'
- Localize messages from nsIMsgFolder.logRuleHitFail()
- Add logging of message filter runs and actions
- Check that we got a non-null header before running a filter on it (and crashing)
- With CONDSTORE, eliminate unneeded flag fetches at startup
- Fix so custom tags (keywords) are visible to all users
- Improve handling of tags on shared folders
- Allow setting/resetting junk marking by user for yahoo/aol to stick
- Don't check subject if spellchecker is not ready
- Grammar issues in mailnews_account_settings.xhtml
- Remove use of nsIMemory
- Replace obsolete GetStringBundleService call in SeaMonkey
- SeaMonkey crashes on macOS Ventura 13.0
- Website Navigation Bar has stopped working
- SeaMonkey switch to fullscreen does not work on macOS Ventura 13.0
- Continue the switch from Python 2 to Python 3 in the build system
- Added support for clang 15 and macOS SDK 11.3
- Verified compatibility with Rust 1.65