• Unified Chrome + Firefox package — one codebase, dual manifests (MV3 / MV2), build scripts and release zips
• EN/RU localization — Options, dialogs, alerts, tree labels, help, context menu
• Language switcher — Auto / English / Russian (extensible via _locales/locales.json)
• Main window follows UI language — not only Options (background i18n + live titles)
• Help in EN and RU — switches with language setting
• Context menu localized — rebuilds for the selected language
• Firefox AMO readiness — data_collection_permissions, correct 128×128 icon
• CI — locale key parity check + smoke build on push/PR/release
• Easy new languages — copy en → new locale, register in locales.json, CI validates keys