Just switched from Firefox to Yandex. It is based on Opera which uses the Chromium engine. The installation grabbed all bookmarks and cookies from Firefox, the switch was almost seamless. Looks very good so far. I will never open a unknown website without NoSript blocking JavaScript and executable content, I want to explicitly white-list all sites. NoSript is not in the extension library, that was almost a no-go. But I could install it from https://chrome.google.com/webstore/detail/noscript/doojmbjmlfjjnbmnoijecmcbfeoakpjm and transfer the white-list from Firefox.