Say I have a webpage with something like:
Is there any way to have it launch an ssh terminal?
My preference is that this works on Ubuntu with Chrome.
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If you mean that you want your machine to launch SSH, then you need to change the protocol handler for ssh in your operating system.
There is an example of setting up a protocol handler in Ubuntu here. In Windows you need to alter the registry.
Web sites can't make visitors open client-side custom handlers; it would be a security risk. But a page can have Mozilla and Firefox register a web service as a protocol handler. Documentation for that is here.