обломки by Rudolf Polzer

("oblomki" - meaning "fragments" or "debris")

An extension that installs a font on all websites you visit to wreck russian text while leaving other Cyrillic languages alone. Fun! Also fixes the spelling of Ukraine, Kyiv and russia.

If the font is too annoying on general non-russian websites, you can click the extension icon in the toolbar, then "Manage extension", then "Permissions and data" (or on Android, "Extensions", then "обломки", then "Permissions"), and enable it either for all sites, .ru domains only, or (on desktop Firefox only) for a set of selected ones.

Furthermore I am of the opinion that NAFO Article 5 must be invoked.