If the outcome of the prototype in FF is “yes, implementing this version is possible without causing deep other problems”, your solution might allow realizing the huge speedup you saw across different browsers, so please don’t let the wording keep you from experimenting with what might come.
After all, that Mozillians decided to prototype at all means that the changes in specification since this was declared harmful might have solved enough problems.
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If the outcome of the prototype in FF is “yes, implementing this version is possible without causing deep other problems”, your solution might allow realizing the huge speedup you saw across different browsers, so please don’t let the wording keep you from experimenting with what might come.
After all, that Mozillians decided to prototype at all means that the changes in specification since this was declared harmful might have solved enough problems.