If you have faced them since Abrowser's upgrade to version 62, then try installing the package "xserver-xorg-hwe-16.04" (in Trisquel 8's repository). That is what ivanruvalcaba did: https://trisquel.info/forum/it-possible-apply-ubuntus-lts-enablement-stack-upgrades-trisquel-8

However, he does not know whether Abrowser's upgade or Xorg's upgrade solved the rendering glitches.

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