What arrows do you mean and on which toolbar are they located?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

You can open the Customize page and set what toolbars (Show/Hide Toolbars) and toolbar items to display.

• Right-click empty toolbar area => Customize
• "3-bar" menu button => Customize
• View -> Toolbars
  *you can tap the Alt key or press the F10 key to show the hidden Menu Bar temporarily

• if missing items are in the Customize palette, drag them back from the Customize page to the toolbar
• if you do not see an item on a toolbar and in the Customize palette, click "Restore Defaults" in the Customize page to restore the default toolbar set.

• https://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars

I'm having a hard time getting the screenshot but on the browser on the right hand side there's an up arrow ^ to scroll up and towards the bottom it's inverted (v) that allows you to scroll down to see the bottom of the page. The bottom arrow is the one that is missing.

It's not on the top toolbar but on the extreme right hand side of the browser. Hope this makes sense.

And thanks in advance for any help!!