Even a “traditional” password would have a “list” that attackers could know (all the possible characters that can be used in a password), now compare this set of ±150 characters with the set of possible words that can be used (probably close to 250k per language if you take out some similarities).
Even with only 4 words, the number of possibilities is astounding.
Since I have not seen it yet in the comments, I use Floorp, a Firefox fork with some nice UI improvements (and apparently some performance improvements, but both are very fast for me).