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I'm using uBlock Origin (which is anyhow very recommended addon) and used it to block these pop-ups. This is how:
Once a pop-up pops-up:
Click on the add-on's icon.
Click on the picker icon on the buttom of the window that opens:
Click on the pop-up you want to never show again (make sure you point the mouse pointer at a spot that selects all of the pop-up'...
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Try instead Combining Grapheme Joiner character Unicode: 034F which has no visible glyph.
Should be ignored by most applications, but still circumvent trimming of empty rows.
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