Release 2.5.7.1

Maintenance release:

• Add sourcemap files: browser-polyfill, purify (issue #149, #104)
• Disable debug logs and fix error getting host when showing contextmenu (issue #157)
• Fix errors being logged when sent messages have no receiver
• Fix column visibility list not showing active columns
• Fix error adding MutationObserver to framesets (#153)
• Update Russian, Korean and Greek translations (#113, #132, #135, #158, #159)

Release 2.5.7.0

This new version was finished many months ago but due to some unforeseen and tragic events in my personal life I could not find the time and motivation to release this at the time.

• Context menu reworked (use less resources, only show relevant items)
• Optionally hide address bar icon (#133)
• Optionally hide right click context menu 
• Update 3rd party libs: jQuery (3.7.0), DOMPurify (2.4.7), marked (2.1.3), DataTables (1.13.6)