Waiting for upstream to take their merry time to release 3.0 hardly seems like a good way to deal with the problem to me. If fixing it independently is too much work, how about just disabling justified text completely when using Pango? I find it slows down the browser to an almost unusable crawl in most cases anyway. If you don't want to do this unconditionally, how about a MOZ_DISABLE_JUSTIFY environment variable?
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