When I check about:config in FirefoxPortable, I have several values that are modified and causes problems:
general.useragent.override;Mozilla/5.0 () Gecko
Even if I reset them they are put back to those values next time I start FirefoxPortable.
This leads to several website to be inaccessible
The tls value leads to a "Secure Connection Failed" "Error code: ssl_error_unsupported_version" on few websites (putting tls back to 1 fixes the problem)
The useragent modification leads to some website to say that my browser is not supported and they block the access (resetting the value fixes that)
I have disabled all addons and it is still the same.
If I start firefox from the FirefoxPortable\App\Firefox folder I don't have the problem ...
I am using the latest FirefoxPortable version that I reinstalled today on top of the old one.
I haven't found yet which value make the captcha for this forum unavailable too, I have to connect with chrome.
Thank you in advance for your help
PS: There is also this value: accessibility.blockautorefresh;true that is really annoying.