Flag links to paywall sites
Flagwall will scan each page for text hyperlinks to known domains that operate a paywall. It will flag each of these links with a dotted red underline so that you know before you click on it that it's likely to hit you with a paywall.
Flagwall does not attempt to block or subvert paywalls in any way. It merely exists to give the user an option of avoiding the typical bait and switch of following a link, only to be faced with a paywall.