LoadRunner 12.53 (Vugen) doesn't invoke FireFox v52 during recording web browser. After I start Recording, I find firefox in windows process but it doesnt show up, it just stays in the process. But I can easily opens it up if I stop recording. I have no problem with chrome but something is preventing Firefox from showing up.
The problem is that you upgraded FireFox on your machine to version 52. This version is not supported by LoadRunner TruClient.
When using TruClient - You should never upgrade FireFox on the that machine.
From HP official site:
Version 12.53 release notes:
Changes to browser version support:
Chromium 46
Firefox 40.0.3
Internet Explorer 10 and 11 (Internet Explorer 9 is no longer supported)
If you are trying to record an HTTP protocol, recording via FireFox is unrecommended. Record your script using Google Chrome or Internet Explorer.
When recording HTTP, you can use any browser. It makes no difference whatsoever. When replaying, you can set the User-Agent string under run-time settings or choose FireFox as the replay browser.
Hope this helps.