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Keeping the text size the same while using the mouse

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I have a new computer and whenever I use Firefox and use my mouse, the font size changes constantly. I have tried to use the customize button but it is not working. I would like to font size to be 120 on all pages. Thank you

I have a new computer and whenever I use Firefox and use my mouse, the font size changes constantly. I have tried to use the customize button but it is not working. I would like to font size to be 120 on all pages. Thank you

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¡Hola!

Per Use mouse shortcuts to perform common tasks in Firefox:

"Zoom In Ctrl + Scroll up Zoom Out Ctrl + Scroll down"

Are you pressing Ctrl inadvertently?

Please also see Font size and zoom - increase the size of web pages.

Let us know if this solves your question.

¡Gracias!