I use:

• specific to Wikipedia:
  • the text editor exclusively, with a monospace font and syntax highlighting
  • a watchlist showing all changes with own edits, Wikidata edits and bot edits hidden
  • the Timeless skin
• other:
  • Firefox (with about:config tweaks for privacy) as my primary web browser (previously Ungoogled Chromium)
  • Linux as my primary operating system, specifically a Void installation (also sometimes Artix-s6), where I currently use Sway as my desktop