Improve the error message when browser fails to load profiles from localhost due to permission issues

## Description
I use Firefox Profiler with [samply](https://github.com/mstange/samply), and to view the results in firefox profiler, I port forward the samply server to localhost. This used to work no problem until around 2 weeks ago. Now, when I do this, I get the following error:

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## Firefox Profiler
### Safari cannot import local profiles

Due to a [specific limitation in Safari](https://bugs.webkit.org/show_bug.cgi?id=171934), ⁨Firefox Profiler⁩ is unable to import profiles from the local machine in this browser. Please open this page in ⁨Firefox⁩ or Chrome instead.

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Which is weird because I'm doing this on Chrome (`Version 142.0.7444.162 (Official Build) (arm64)`)

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-947)