Quick Link Highlighter od Vegastars

Quick Link Highlighter makes external links easy to spot on any page by applying a subtle overlay to links that point off-site. Click the toolbar button and the extension injects a safe stylesheet to highlight external links for fast review. The add-on runs only when you explicitly ask by clicking the button, stores a single user preference for the highlight color, and does not load any remote code or external resources. The extension requests only the minimal permissions needed to run (activeTab and storage) and uses a standard, secure content-security policy.