JAVASCRIPT
JavaScript was initially developed in 1996 for use in the Netscape Navigator browser. In the same year Microsoft released an implementation for Internet Explorer. This implementation was called JScript due to trademark issues.
1.8.5 Version
Version shipped in Firefox 4. Released July 27, 2010. Includes many new features for ECMA-262 Edition 5 compliance. This is the last JavaScript version.
1.8.1 Version
Version shipped in Firefox 3.5. Released on June 30, 2009. Includes the TraceMonkey JIT and supports native JSON.
1.8 Version
Version shipped in Firefox 3. Released in June 2008. Includes expression closures, generator expressions and Array.reduce()
1.7 Version
Version shipped in Firefox 2. Released in October 2006. Includes generators, iterators, array comprehensions, let expressions, and destructuring assignment.
1.6 Version
Version shipped in Firefox 1.5. Released in November 2005. Includes ECMAScript for XML (E4X), new Array methods plus String and Array generics.
1.5 Version
Version shipped in Netscape Navigator 6.0 and Firefox 1.0. Release on November 14, 2000. Standardization work to be compliant with ECMA-262 3rd Edition.