Difference between Firefox Options and Firefox default stylesheet

I understand the concept of UA stylesheets. But I'm confused about the difference between a UA stylesheet and Firefox options.
To clarify - I know I can change the font face, size and colour in Firefox but those changes do not appear in Firefox's default stylesheet html.css.
If I check my changes in Firebug, the element changes are shown in the computed tag. So, for example, if I change the font size to 20px and the colour to Maroon, and then click the <p> element in Firebug then click computed, those changes are shown. But when I open the Firefox stylesheet, they are not shown. What I would like to know is where those amended stylesheets are stored on my computer and how they affect the cascasade.

Thank you for your response. I just need a bit more clarification. I've created a page with no author stylesheet therefore the page is being styled using the default html.css. If, for example, I change the font size on my computer to 32px via Tools>Options>General - that stays changed for every visit thereafter and for every site I visit thereafter (where the text is sized using a relative unit of measure).
What I would like to know is where is that local change being saved - is it being saved as a style for p or body elements in a different css file? It does not appear in the html.css stylesheet but it must be save somewhere. My understanding, therefore, is that my unstyled page is being styled by html.css plus a local styled generated through options. Sorry, I know I'm being pedantic on this - I've developed an understanding block on this.

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