Firefox consumes a lot of CPU resources

Romanas give to me task which tells that Firefox consumes a lot of CPU resources and computer getting warm because of that thing. When firefox opened, It use about 40% CPU resources. Romanas have good notebook and this is ridiculous that It is use this much resources.

After researching I have been able to devise 3 possibilities:
1. Firefox have too much plugins.
There are many reasons for Firefox hanging and/or using excessive memory. Plugins and extensions, which are not part of the default Firefox install may cause this. Poorly optimized sites which load several images and ads may cause this. These are inevitable. I checked in firefox Tools>Add-on Extension, Plugins and I found very much useless plugins. I disabled them and I saw that Firefox use only 0,2% CUP resources. It works !!!
2. Included to firefox plugins flashblock plugin.
Flashblock is an extension for the Mozilla, Firefox, and Netscape browsers that takes a pessimistic approach to dealing with Macromedia Flash content on a webpage and blocks ALL Flash content from loading. It help for using a lot of RAM memory.

3. JavaScript
JavaScript is a scripting language that is included in many web pages to enhance the experience with menus, sounds, and other features. In an individual site, extensive use of JavaScript may require significant CPU usage. A Firefox add-on, called NoScript, allows you to selectively disable JavaScript on websites. You can also selectively enable and disable types of JavaScript actions, which may affect performance.
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Created by Armandas Rokas