There just never was a moment where the dominant browser vendors saw a strategic advantage to adding a second language. There was always talk and experiments wi

There just never was a moment where the dominant browser vendors saw a strategic advantage to adding a second language. There was always talk and experiments with other languages, but nothing which got wide support by major browsers. Netscape/Mozilla always lacked resources compared to the competitors Microsoft and Google which have much deeper pockets. Supporting more languages would be a waste of resources from their perspective. They believed in fixing and improving JavaScript rather than adding another language. Microsoft did support VBScript as an alternative, and at one point they had such a dominant market share they probably could have pushed VBScript as a viable JavaScript alternative e.g by adding cool features only to VBScript. But MS instead decided to stop developing the browser at that point. Google invested heavily in their optimizing JavaScript engine to make the web more viable as an application platform. Again this means they didn't have any interest in adding a second language since they would have to make the same investment once more for no benefit. It is true that JavaScript was not well liked. But the frustration was primarily around incompatibilities in the DOM API and browser-specific bugs. Adding a second language would not solve any of that, it would just double the amount of incompatibilities and bugs.