Maybe you should target corporate software engineering and QA managers who lead the teams building their own commercial web applications. It should be fairly straightforward to target those people through conferences and online forums. Corporate QA groups waste a lot of time manually filling out bug report forms, and those often end up missing key data which prevents developers from reproducing the bug thus wasting even more time. If you can provide a tool that will accelerate QA cycle times and cut labor expenses through automation then corporate customers will be willing to pay for it, and go through the hassle of installing it on their testing computers.