zero-width-chrome-extension

Following on from the recent discussion [0,1] on zero-width characters and how they might be used to fingerprint messages. chpmrc built an extension [2] to detect these characters, but as some people mentioned, the way the extension worked was less than ideal. I decided to build a better version that works in the background and alerts the user if they have selected text containing these zero-width characters, showing a notification that allows you to copy a clean version, and a version with zero-width characters replaced by emojis. I also wrote a blog post about it [3]. [0] - https://news.ycombinator.com/item?id=16749422 [1] - https://news.ycombinator.com/item?id=16754987 [2] - https://github.com/chpmrc/zero-width-chrome-extension [3] - https://medium.com/@aidobreen/hidden-text-fingerprints-and-h...

Right now there is 'only' a chrome extension that I know of that just scans for zero-length-characters: https://github.com/chpmrc/zero-width-chrome-extension For Firefox there is this extension that does search and replace based on regex (so you need to create the rule by yourself). https://addons.mozilla.org/de/firefox/addon/foxreplace/?src=... Apply an autoload rule with these settings: Name: zero length replacement HTML: Output only URL: <entering no url matches all sites> Replace: (\uFEFF|\u200B|\u200C) Type: Regular expression With: <span style="background-color:#F00 !important">&#x1f633;</span>