Chrome Web store kills the system

My ave­raged laptop Leno­vo T61 is the home of two Linux sys­tems — Linux Mint Pet­ra and Pep­per­mint Five (actu­ally the­re are three more sys­tems installed, but that’s not the point here). “Pet­ra” and “Five” are the two most used ones. I use Chro­mi­um, Ope­ra and Fire­fox on the Five, and Fire­fox and Chro­me on Pet­ra.…