Go to a change https://gerrit.wikimedia.org/r/#/c/187879/3, click on the gitbit https://git.wikimedia.org/commit/apps%2Fios%2Fwikipedia/6532021b4f4b1f09390b1ffc3f09d149b2a8d9d1 link next to a patch set, then behold: MAGIC!!! https://git.wikimedia.org/commitdiff/apps%2Fios%2Fwikipedia/712f033031c3c11fe8d521f7fdac4252986ee741 GitHub like diff viewer! No more "All Side-by-Side" w/ 1e6 tabs open.
Enjoy!
Brian