Why has my Firefox become so slow, even though I don't have any add-ons?

The settings tell me that I don't even have any add-ons installed. But FIrefox is still very slow, especially on those bigger sites.
Resetting Firefox doesn't help either..

''However, Java Deployment Toolkit 7.0.670.1 has been blocked...''
The Java Deployment Toolkit plugin (also called Java DT) is a specialized plugin designed for web developers and network administrators and is not related to your general usage of Java (and is not required to be running to enable Java content in the browser.) It's "highly unlikely" this is the source of your browser slowdown. Oracle likes to "bundle" this plugin with Java SE for unknown reasons. Mozilla still considers Java DT to be vulnerable, and has considered it to be vulnerable for a long time...that's why you see this message (and probably will continue seeing it, unless you delete the plugin.) You can delete this plugin from the list of firefox plugins, but it will probably come back when you update Java. If you're interested in reading/talking more about specifically Java DT, we made a thorough discussion thread at the mozillazine support forum here: http://forums.mozillazine.org/viewtopic.php?f=38&t=2877359
Sounds like you could benefit from disabling all Java content in the browser. How that is accomplished is explained in the above thread.

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