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Thanks Chris.

I cannot say that the developer's suggestion to use an older version of the library to fix such relatively basic functionality (IMHO) raises my confidence in the longer-term viability of lightGallery.

Have you evaluated PhotoSwipe? It implements correct history / back button behaviour out-of-the-box. It furthermore supports pinch-to-zoom. Maybe that could be an option for XenForo 2.1.

If not then I'd be glad if you could consider switching to lg-hash 1.0.1. The diff between version 1.0.1 and 1.0.4 (https://github.com/sachinchoolur/lg-hash/compare/1.0.1...1.0.4#diff-86f4b41fdda5a5e53dcd5e5e6441486f) seems to be relatively small.