From an extension page I followed the "repo summary" link to https://git.wikimedia.org/summary/mediawiki%2Fextensions%2FTextExtracts , but I couldn't see a link in gitblit to clone the code.
It turns out if you're zoomed in in Firefox or chromium-browser, gitblit's Summary window simply hides "repository url" and the [Git v] dropdown underneath it. They don't seem to be moved to an overflow menu or hamburger icon, they vanish from the UI.

Workaround: zoom out, but you don't know what you're missing. "Guess I'll skip this project and join another that will let me clone it."

Filed upstream, with screenshot, as https://github.com/gitblit/gitblit/issues/910 . Note WMF intends to Gitblit-Deprecate , and T108864: Update mediawiki.org templates to link to Diffusion, not gitblit.