R34 Wiring Help

[MadMatt00001]

Hey all, I was wondering if somebody could tell me an easy way to open up the 2 little compartments on the white wiring box located in the drivers side foot well? It has 2 grey tabs across them that are preventing me from opening them up, I've tried pulling and prying at them, but they won't budge, I don't want to pull too hard in case I snap something, so I wanted to ask on here first before I go further. It's so I can test the continuity of some wires, it's an R34 coupe NA.

Thanks in advance

 

MadMatt