I know Browsers can mask themselves, but I doubt the web viewer can.
agnes b. riley
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From FM: "The web viewer is intended to be a window into a web page driven by your FileMaker database data, not a fully functioning Web Browser."
Each version of FM has a web browser baked into it, and as far as I know this can't be changed.
It doesn't matter what your system default browser is, FM uses IE's engine on Windows to render stuff in the web viewer, it's not configurable. On Mac, it's webkit (safari) that is used.
It sounds like the page you are going to might be doing some agressive client checking of the user agent string, which might be a little different from the regular IE when identifying itself.
The webviewer uses always IE8 unless you put FileMaker in the registry on the right entry to have it not use IE's compatibilty mode.
Mike Duncan noted the info that FileMaker uses an internal version of a browser based on the platform on which FMP is running, so it won't matter what version of browsers you do or do not have on the specific computer. The problem you are encountering is caused by the testing and access restrictions of the target website itself, which is not allowing the FMP-embedded browser to access the site.
You could use an Open URL script step to have your system's default web browser open this site externally from FMPro rather than using a webviewer in FMPro.
I need the browser open in FM so I can use the MonkeyBread Plugin on it (form fill)
You need control of the website itself in that case, as it's not going to allow FMPro webviewers in without some site changes.
The browser engine isn't a preference. On Mac FMP uses Safari, on
Windows it uses IE.
If you use IE10 or later, perhaps you need IE9 or before emulation.