Does it make any difference if you use a link from a search result? For example, from a DuckDuckGo "site:" search: https://duckduckgo.com/?q=site%3Aamazon.co.uk Have you noticed issues with any other sites? ---- If you are not intentionally using a proxy server, try to rule that out as a possible issue. On the Settings page -- * Windows: "3-bar" menu button (or Tools menu) > Settings (previously "Options") * Mac: "3-bar" menu button (or Firefox menu) > Preferences * Linux: "3-bar" menu button (or Edit menu) > Preferences * Any system: type or paste '''about:preferences''' into the address bar and press Enter/Return to load it -- there's a tiny search box at the top of the page. Type ''proxy'' and Firefox should filter to the "Settings" button, which you can click. Try "No proxy". Any difference?