Glare/Reflection from light sources like the sun, light bulbs, and florescent bulbs can make reading a Tablet very hard because the reflection from the light can make reading your Kindle Fire Tablet almost impossible because of the reflection from the light, and your own reflection.
Using an Anti-Glare Screen Protector like GreatShield EZseal Plus 100% Bubble Free Guaranteed Anti-Glare (Matte) Screen Protector Film Mask for Kindle Fire can make reading in the sun a lot easier then without an anti-glare screen protector.
The Anti-Glare Screen Protector Mask also protects your Tablets from Fingerprints, Scratches, dust, and oil.
The matte surface of the screen protector reduce reflection, and it also has an anti-stain layer which reduces fingerprint and oils from being as visible.
The Screen protector Mask is only 0.188mm thick, so it won't make your Kindle Fire weigh or be a lot thicker, and would not be noticeable.
A Screen Protector Mask is better then a thin piece of plastic because you can reuse it, and it is not as fragile as those thin fragile screen protectors which could get crumpled, wrinkled, and damage over time. Plus, it is a lot more easy putting on a mask then a thin piece of plastic which moves around a lot. Plus, there is no need to use a applicator like a squeegee/card to smooth out the bubbles and wrinkles which can take a long time compared to just applying a simple mask onto your Kindle Fire Tablet's screen, and pushing it on.
Plus, buying a mask is a better deal then buying a screen protector which looks like an oversized piece of tape which cost too much, and does not look like it was built to last like a screen protector mask which is a solid piece of plastic which is a solid piece of clear plastic which won't wrinkle, bubble, or get ripped.