JAVASCRIPT VERSIONS
Mozilla, as a descendant from the original Netscape, is the only browser vendor that has continued the original JavaScript version-numbering sequence. When the Netscape source code was spun off into an open-source project (named the Mozilla Project), the last browser version of JavaScript was 1.3. (As mentioned previously, version 1.4 was implemented on the server exclusively.) As the Mozilla Foundation continued work on JavaScript, adding new features, keywords, and syntaxes, the JavaScript version number was incremented. The following table shows the JavaScript version progression in Netscape/Mozilla browsers.
| BROWSER | JAVASCRIPT VERSION |
| Netscape Navigator 2 | 1.0 |
| Netscape Navigator 3 | 1.1 |
| Netscape Navigator 4 | 1.2 |
| Netscape Navigator 4.06 | 1.3 |
| Netscape 6+ (Mozilla 0.6.0+) | 1.5 |
| Firefox 1 | 1.5 |
| Firefox 1.5 | 1.6 |
| Firefox 2 | 1.7 |
| Firefox 3 | 1.8 |
| Firefox 3.5 | 1.8.1 |
| Firefox 3.6 | 1.8.2 |
| Firefox 4 | 1.8.5 |
The numbering scheme was based on the idea that Firefox 4...
