Some websites claim that Javascript is not activated, but Firefox says it is.

Certain websites claim that I do not have Javascript activated, but it is activated according to Firefox settings (Tools > Options > Content). One example is the German site www. autoscout24.de; when I go there I get the message "Bitte aktivieren Sie JavaScript in Ihrem Browser, um alle Funktionalitäten unserer Webseite nutzen zu können" in red, with tips on how to activate Javascript. Another site is my e-mail service, in which I cannot use certain features which require Javascript. Their help service recommends I clear the cache (did that, didn't help) and delete all cookies (don't want to do that as it would cause annoyance on some websites, so I just deleted cookies pertaining to e-mail service; didn't help either). I also tried starting Firefox in 'safe mode', which didn't help either.

Do you use any security add-ons that could selectively block scripts based on the URL? NoScript is the leading example of such an add-on, but there might be others. If you use a proxy server in Firefox but not your other browsers, that also could filter your results.
Generally speaking, if you start up in Safe Mode, you can bypass most add-ons, so if that didn't work, you could try a follow-up step of testing with a new profile.
First, I recommend backing up your Firefox settings in case something goes wrong. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, close all Firefox windows and start up to the Firefox Profile Manager as described in: [http://support.mozilla.com/kb/Managing+profiles Managing profiles].
Create a new blank profile and check those sites. Any change?
To switch back to your normal profile, close all Firefox windows, start up the Profile Manager, and choose that profile.

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