How Do I Change Bookmark Icon In Firefox?

Win 10, Latest release of Firefox. I want to make the toolbar icons easier to recognize. Is there a quick way to do this?

 

What toolbar? Do you mean Taskbar?

 

Those are 'favicons'.
Do you want to change or make them bigger?

 

Are you talking about some thing like this.

 

This addon allows you to change the font and size in Firefox, unlike changing the font and size on a webpage but not in FF itself. (ctrl + makes text on pages larger but doesn't do a thing for menus and icons in FF Itself).
https://addons.mozilla.org/en-US/firefox/addon/theme-font-size-changer/

Try it and if it doesn't do what you want, then remove it.

 

Just change the icon...

 

Icons are circled in red.

 

You first posted, you want to make the icons easier to recognize. I assumed, incorrectly, that you wanted the toolbar icons larger.

Now you are saying you want to change the icons. As far as I can determine, there is no way to change a site's icon. I have tried to change one icon in FF for awhile and nothing works.