How To Zoom In / Out In Mozilla Firefox and Other Handy Shortcuts
People do not really like to put their hands away from keyboard while concentrating in typing but they still been forced to use the mouse to click on something. If you learn the available shortcut keys or create new ones for frequently used commands, you can work around these obstacle by saving quite lots of times.
First, you may notice some webpages have really small font size to read on, and the slowest way to zoom in or out of font size quite not efficiency while doing work like the image shows below:-

This is the original font size setting:-

Here is the quickest way to increase/decrease the font size using the scroll of the mouse wheel. Just hold the CTRL key and scroll the wheel up for decreasing and down for increasing.
| Ctrl+T | Open a new tab |
| Ctrl+W | Close the current window or tab |
| Ctrl+Shift+T | Undo close tab (re-open the last closed tab) |
| Ctrl+Tab | Switch to the next tab |
| Ctrl+Shift+Tab | Switch to the previous tab |
| Ctrl+[0-9] | Switch to the 1st, 2nd, 3rd, 4th, etc. tab |
| / | Open the “Find Text As You Type” widget (bottom of screen) |
| ‘ | Open the “Find Links As You Type” widget (bottom of screen) |
| Ctrl+G | Find the next occurrence of a search phrase |
| Ctrl+Shift+G | Find the previous occurrence of a search phrase |
| Ctrl+K | Move cursor to the Web Search widget (top right of screen |
Some other handy keyboard shortcuts
F1 – Help
F5 – Refresh page
F11 – Fullscreen
TAB - Jump to next focus point.
Enter - Submit/Go<
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