When browsing with Mozilla Firefox, you can now set a default zoom level for all websites. And you can still set custom zoom levels for individual websites. This feature has been added in Firefox 73, which was released on February 11, 2020.
Setting a default zoom level for all websites
It's easy to tell Firefox to automatically zoom in or out on all websites that you visit. To begin, click the menu button in the upper-right corner of the Firefox window and then select "Options" (select "Preferences" on a Mac).
Scroll down to the "Language & Display & # 39; in the General pane. Click the" Standard Zoom "box in the" Zoom "section and select the desired zoom level. You can select a zoom level choose between 30 and 300 percent.
If you wish, you can also check the "Zoom text only" option, which enlarges or reduces the text on a web page, but does not zoom in on other content such as images. 
If you use the & # 39; Standard zoom & # 39; option, you must update Firefox. Click Menu> Help> About Firefox to check for updates.  Setting a zoom level for one website
To quickly set a different zoom level for a specific website, click the menu button at the top right and then click the plus sign (+) or minus sign (-) to respectively enter or exit You can see the current zoom level in the address bar.
Firefox remembers it t zoom level that you have set for each website.
If you want to change the text size only, click & # 39; View & # 39; in the menu bar, move your mouse over & # 39; Zoom & # 39; and then click & # 39; Zoom Text Only & # 39 ;.
There are also some handy shortcuts that you can use to zoom in or out quickly. Press Ctrl on Windows or Cmd on Mac while doing one of the following:
- Scroll in or out with your mouse to zoom in or out.
- Press the plus sign (+) to zoom in or the minus sign (-) to zoom out.
- Press zero to reduce the zoom level to 100 percent.
These functions, new and old, can help you strain your eyes and make reading on the internet much easier.