By default, the Firefox browser has a limitation of the minimum and maximum scale. They are equal to 30 and 500 percent, respectively.
But these values can be changed through experimental settings. They are available in the tab. To change the maximum scale value, you need to find the parameter through the search and specify the appropriate value. For example 200. Similarly for the minimum value, only the parameter is named. For example, you can specify 50. After restarting the browser, the changes will become available and can be visually checked.