How to remove add-ons

I am running the latest version of Firefox (17.0.1)

I have a number of add-ons all of which are disabled and which I would like to remove. Unfortunately there is no remove button.

I have read the FAQs and community help which tells me that if there is no remove button then the add-ons are there through being added globally by other software. However on of the add-ons that I want to remove is Google Toolbar for Firefox - how could that have been added by another application?

Any suggestions gratefull received.

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