detektIIIF is a browser extension for Chrome and Firefox that detects IIIF resources in websites. It is possible to collect IIIF manifests in a basket and send them to any compatible IIIF application. detektIIIF is extensively configurable and can be customized with individual themes. The browser extension also checks for the presence of various interoperability features (CORS, SSL, etc.) and displays warnings if necessary.
detektIIIF2 is available for Google Chrome: https://chrome.google.com/webstore/detail/detektiiif-2/aaodcobgcadinjipaocibamdfcffpcpp
and for Mozilla Firefox: https://addons.mozilla.org/en-GB/firefox/addon/detektiiif2/
Check out the source code of detektIIIF on https://github.com/seigedigital/detektiiif2 If you would like contribute to the future development of detektIIIF you are welcome to do so.
The development of detektIIIF was a collaboration between seige.digital and the Zentralbibliothek Zürich.