You've been looking for a more sophisticated templating engine for JavaScript. Here it is.

• Rich Powerful language with block inheritance, autoescaping, macros, asynchronous control, and more. Heavily inspired by jinja2
• Fast & Lean High-performant. Small 8K gzipped runtime with precompiled templates in the browser
• Extensible Crazy extensible with custom filters and extensions
• Everywhere Available in node and all modern web browsers, with thorough precompilation options

E10S is short for “Electrolysis”. Similar to how chemists can use the technique called electrolysis to split water into hydrogen and oxygen, we’re using project Electrolysis to split Firefox into a UI process and a content process. Splitting UI from content means that when a web page is devouring your computer’s processor, your tabs and buttons and menus won’t lock up too.