Enable Right Click in Firefox Using RightToClick:
1. First of all, download and install RightToClick. Once the add-on is installed you will see a golden pointer at the lower right corner of Firefox and also right next to the address bar.
2. When you visit any website which has disabled right click options, click on the mouse pointer and it will enable the right click options on that page. The pointer will turn green as shown below.
3. You can access advanced option either by right clicking on the mouse icon or by going to Tools > Addons and then going to options of RightToClick.
If you know any other extension or add-on that performs the same feature, please share with us.