making extension buttons bigger in firefox

I feel like I must be getting up there in years. Anyway, today I realized that the extension buttons in Firefox are way too little for my tired eyes.

Here’s how to make them bigger:

1. In a new tab, type or paste **about:config** in the address bar and press Enter. Click the button accepting the risk.
2. In the filter box, type or paste **devp** and pause while the list is filtered
3. Double-click **layout.css.devPixelsPerPx** and change its value to **1.5** and click OK. That corresponds to 150% of the classic font size.

Where I got this info: i would like to increase the size of my address bar, tabs and toolbar | Firefox Support Forum | Mozilla Support