Portable SeaMonkey full changelog

SeaMonkey 2.53.18.2 contains (among other changes) the following changes relative to SeaMonkey 2.53.18.1:
Block set-cookie from multipart/x-mixed-replace with pref bug 1864385.
Check if WorkerRunnable::Run runs on top of WorkerThreadPrimaryRunnable::Run in a worker thread bug 1867982.
Process pairs in coord list in PolyArea bug 1878211.
Cherry-pick update to dav1d bug 1881093.
Land NSS NSS_3_90_2_RTM UPGRADE_NSS_RELEASE bug 1880562.
Fix DSN for send later bug 815638.
Catch webNavigation error during tab restore bug 1885748.
SeaMonkey 2.53.18.2 contains (among other changes) the following major changes relative to SeaMonkey 2.49.5:
The Bookmarks Manager has switched its name to Library, and now also includes the History list. When History is invoked, the Library will be shown with the History list selected. The extensive modifications were needed because of Mozilla Gecko platform API changes.
Download Manager has been migrated to a new API. Although it looks pretty much the same as before, the search option is missing and some other minor details work differently. The previous downloads history is removed during the upgrade.
The layout panel was added to the CSS Grid tools.
TLS 1.3 is the default SSL version now.
Support for all NPAPI plugins like Flash, Java and Silverlight has been removed. For displaying pdf files in the browser you can use pdf.js-seamonkey from Isaac Schemm.
SeaMonkey now uses a new api for formatting regional data like time and date. Default is to use the application locale of the current SeaMonkey build. If you use a language pack or a different OS formatting this is usually not desired. You can change the formatting from the application locale to the regional settings locale (OS) in the preferences dialog under "Appearance".
SeaMonkey 2.53.18.2 uses the same backend as Firefox and contains the relevant Firefox 60.8 security fixes.
SeaMonkey 2.53.18.2 shares most parts of the mail and news code with Thunderbird. Please read the Thunde