In Firefox, where is the 100% for the size of font?

That’s strange, as soon as I posted the OP it said “10 minutes ago”

By the way I don’t see the three horizontal bars for menu on Firefox.
Okay now it is corrected, (the time since posting the OP)

If you have the menus showing:
View -> Zoom ->Reset

If you do not have menus showing, click the settings “hamburger” in the upper right. There’s a 3-section row at the top. a minus sign to zoom out (shrink), the current zoom as a percentage and a plus sign to zoom in.

If the zoom is not 100%, click it to return it to 100%.

Does holding the Ctrl key down and clicking either + or – achieve your goal?

I use Ctrl-0 (the number zero) to reset my zoom level when it gets messed up.

And yes, the way they do menus in newer editions of Firefox is a bit odd and non-intuitive. It kind of threw me as well, though not terribly badly since I usually used keyboard commands instead of the menus.

@jaytkay “Hamburger”.... I like that!

I know this is not quite what you are asking but when I want to change the zoom, I hold down the Ctrl key then use the scroll wheel on my mouse to zoom in and out. This works for most programmes I use like Chrome, Word, Excel

Yo! @flo! Whadda ya know?

Any of these suggestions do the trick?

@jaytkay The thing is the word Zoom is not there either under the “star” icon. But there is on Explorer under the “wheel” icon.

So the 3 horizontal bar icon is called a “hamburger” menu. https://www.accessibility.barclays.com/firefox-quick-links-hamburger-menu/ At first I thought it was a slang word or something.

@ibstubro and @jerv and @Stinley yes those ideas work thank you all. I’m really curious where Firefox is hiding the menu bar, (hamburger menu)

In the upper right corner of my Firefox screen there is a box at the end of a sky blue bar that has 3 horizontal black lines in it. My menu is there, @flo.

Nice tip, @Stinley. I know literally hundreds and perhaps (literally) thousands of keyboard shortcuts, but I did not know that combination keyboard-mouse shortcut. That’s great. Thanks.

@CWOTUS. No problem. I know lots too. Maybe we should have a question where we swap shortcuts and tips?

@ibstubro It depends, I see it now and have seen it in the past but I was using another computer when I posted this OP, so I guess under what circumstances would you not find it?
Is it the version of Firefox?

Beats me, @flo. I never knew it was there or used it until this question. lol

Okay. Why is called a hamburger menu, by the way?

It looks kind of like a hamburger.