@kroesellbroesell
I had a similar problem but opposite.
UBlock rules from Opera skipped some "Adblock warnings" on Firefox.
👁 The reason was that they were old and when the filters auto updated on FF the problem showed up.
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You could try with the UB Logger or use Firefox > Developer tools and select the window message.
Then Right click, copy the rule as CSS.
Replace CSS Path Spaces with > and add it to uBlock's custom filters.