As France, you're pretty much surrounded by Catholic factions, and you wont be able to invade anyone without invoking the Pope's wrath. However, the HRE will usually get excommunicated, so use that as a chance to snatch some easy territory. To make this even easier, try and get a French pope and boost your pope-o-meter to the max, then call a crusade on Frankfurt and take it with a free army.
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