WebRender should have been enabled on your configuration for some time in nightly. It is possible something has changed recently that broke it for you. Does the corruption only happen on popups? Given it is recent for you, would you be willing to try mozregression to get us a regression window in the last few weeks? https://mozilla.github.io/mozregression/
Bug 1678804 Comment 3 Edit History
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WebRender should have been enabled on your configuration for some time in nightly. It is possible something has changed recently that broke it for you. Does the corruption only happen on popups? Given it is recent for you (at least getting WR in 84 which is confusing :)), would you be willing to try mozregression to get us a regression window in the last few weeks? https://mozilla.github.io/mozregression/
WebRender should have been enabled on your configuration for some time in nightly. It is possible something has changed recently that broke it for you. Does the corruption only happen on popups? Given it is recent for you (at least getting WR in 84 which is confusing :)), would you be willing to try mozregression to get us a regression window in the last 2 months? https://mozilla.github.io/mozregression/