Appeared in Chrome, just now.
I have no idea what Telly is, and I'm not sure if I'm more concerned about potentially having an unknown/malware extension, or about Google arbitrarily deleting files without me asking it to. :/
Searching brings up two similar but different things:
http://productforums.google.com/forum/#!topic/chrome/sHrHCsOdDaU
Neither of them is exactly what I got though.
In %appdata%/Local/Google/Chrome/User Data/Default/Preferences there is the following reference to Telly:
"epbmnbdplhcomkedpjfceakddnbgfjmf": { "ack_blacklist": true, "active_permissions": { "api": [ "tabs" ], "explicit_host": [ "http://www.youtube.com/*" ], "scriptable_host": [ "http://www.youtube.com/*", "https://www.youtube.com/*" ] }, "blacklist": true, "from_bookmark": false, "from_webstore": true, "granted_permissions": { "api": [ "tabs" ], "explicit_host": [ "http://www.youtube.com/*" ], "scriptable_host": [ "http://www.youtube.com/*", "https://www.youtube.com/*" ] }, "install_time": "12987627286281111", "lastpingday": "12989314800829264", "location": 1, "manifest": { "background_page": "html/background.html", "browser_action": { "default_icon": "img/icon-19.png", "default_tile": "__MSG_app_name__" }, "content_scripts": [ { "css": [ "style/yt.css" ], "js": [ "js/lib/jquery.js", "js/contentscripts/core.js", "js/contentscripts/yt.js" ], "matches": [ "http://www.youtube.com/*", "https://www.youtube.com/*" ] } ], "current_locale": "en_GB", "default_locale": "en", "description": "Telly is a fun and simple way to collect and share all the cool videos you find across the web.", "icons": { "128": "img/icon-128.png", "19": "img/icon-19.png", "48": "img/icon-48.png" }, "key": "MIGfMA0GC4gQIDAQAB", "name": "Telly", "permissions": [ "tabs", "http://www.youtube.com/" ], "update_url": "http://clients2.google.com/service/update2/crx", "version": "1.203" }, "path": "epbmnbdplhcomkedpjfceakddnbgfjmf\\1.203_0", "state": 0 },
The install_time value claims to be 26 Feb 2011 and the last ping day is two days later - if it was actually malware I'd expect lastpingday to be newer.
I've definitely never installed anything called Telly myself, and especially not something that looks like it does on this webpage.
It's possible I once installed some old advert blocker for Youtube, but I've got Adblock Plus and Youtube Options covering that so not sure I'd have a reason to.
Given how little information there is searching, I'm not really expecting anyone to have any idea about this, but maybe someone will, so I'll post anyway...
They're using malware as an excuse to block all extensions not installed via the Google Web Store (from January), and to remove existing extensions people have installed, just so they can make even more money by forcing their shitty adverts on people.