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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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