My urlbar (more specifically toolbaritem#urlbar-container.chromeclass-location hbox#urlbar) moves upwards the first time I click it after the tab is opened.

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What I mean: (look at the top specifically!)

So basically what happens is this adds a breakout-extend="true" rule to the item the first time I click the urlbar after the tab was opened. If I change tabs and go back (while both tabs are still loaded) it adds the rule again (and thus moves the bar up again on click):

what the browser toolbox shows on the specific item

If I am to remove this rule via the browser toolbox behaviour is as expected: The urlbar doesn't move at all.

So to fix this I would either need to be able to style what happens after breakout-extend="true" is added or stop it from being added in the first place. I don't know how though.

thanks for any help! :3