This appears to be `lang`-specific in Chrome: if you change the `lang` attribute to `en`, you'll see that it also leaves the word "Extraordinarily" unhyphenated, and overflowing the box. So the difference in behavior seems to be that Chrome applies (its equivalent of) intl.hyphenate-capitalized for `fi` in addition to `de`, whereas Firefox currently only has that setting (by default) for `de`. We can certainly consider setting that pref by default for Finnish, if long words are common enough there that it seems beneficial.
Bug 1706879 Comment 8 Edit History
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This appears to be `lang`-specific in Chrome: if you change the `lang` attribute to `en`, you'll see that it also leaves the word "Extraordinarily" unhyphenated, and overflowing the box. So the difference in behavior seems to be that Chrome applies (its equivalent of) intl.hyphenate-capitalized for `fi` in addition to `de`, whereas Firefox currently only has that setting (by default) for `de`. We can certainly consider setting that pref by default for Finnish, if long words are common enough there that it seems beneficial. [edit: indeed, bug 1787442 is on file about that. Let's go ahead and do it there...]