Intended to somewhat compensate for the lack of a zoom selector dropdown (combobox as often seen in programs as word processors, paint programs, document readers) This toolbar plugin offers a dropdown with zoom factors in the range 50 to 300% in somewhat logical intervals.
When set to Auto-Start (default), the selected zoom factor becomes 'sticky', meaning it stays in effect until a new setting is chosen. Consequently this also sets the toolbar button's default action to use the last selected value. This means you only need to press the toolbar button to have the page zoomed to your last chosen setting after a page refresh.
If you find that one of the zoom factors is 'almost right' and you would like to 'fine-tune' it a little, open the respective file and modify the zoom percentage. Zoom factors are reflected in the various filenames, and the values used are in standard percentage values. However, do not change the filenames as this will cause the plugin to fail, only change the perecentage values inside the files.