Right clicking on open tab yields only 'cut and paste' option.
My (new) computer has some sort of touch control that randomly changes font size. MSM has a tool icon that restores font size, Firefox doesn't. Right clicking on empty tab yields only the cut and paste option.
Wšykne wótegrona (2)
If the zoom level changes on a page, you can reset it to the default using either:
- Ctrl+0 (that's a zero)
- View menu > Zoom > Reset
(If you are using the orange Firefox button and compact two-column menu, you can display the classic View menu by tapping either the Alt or F10 keys.)
On a conventional mouse, you can zoom text by holding down the Ctrl key and using the scroll wheel (forward=larger, backward=smaller). I'm not sure how your touch device works, but if it changes the zoom level without having to hold down Ctrl or another key, that's not very convenient.
Now, regarding the empty tab problem, how are you opening the tab? Have you noticed problems with your right-click context menus in other situations?
Zoom control buttons for Firefox are in the Customize Palette, and can be moved to a Toolbar.
https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars