My Firefox recommendations

• all Firefox Downloads

• uBlock Origin (see uBlock Origin recommendations)
• HTTPS Everywhere
• Redirect AMP to HTML
• View Image
• YouTube Classic
• Cookie AutoDelete (tweaks: enable autoclean)
• Anti paywall

• uMatrix (see my startingpoint)

• Search by Image on Google
• To Google Translate
• Flagfox (tweaks: iplookup.theel0ja.info/add-to-flagfox)

• npmhub
• Reddit Enhancement Suite
• Refined Github

• Privacy Badger
• Decentraleyes
• Facebook Container
• uBO-Scope

• FoxyProxy Standard (check out if your VPN provider has SOCKS proxies)
• Stylus (Dark mode guide, Lists I use)
• Redirector (see Dandelion Sprout's Redirector Assistant List)

• Set Firefox as default browser
• Set search engine to DuckDuckGo (or Startpage)
• Block 3rd-party cookies
• Disable Firefox's integrated tracking protection
• Disable "Highlights" and "Snippets" in the "Home" tab
• Disable telemetry (every toggle under "Firefox Data Collection and Use")
• Disable "Deceptive Content and Dangerous Software Protection" (Google "Safe Browsing")

• browser.ctrlTab.recentlyUsedOrder = false
• view_source.wrap_long_lines = true
• extensions.pocket.enabled = false
• general.autoScroll = true (useful on linux especially)