ESR60-based Tor Browser bundles are not built reproducibly with Stylo enabled using rustc > 1.25.0
Contrary to our testing results the .dmg bundles we produce for 8.0a9 are differing on two machines. And it turns out Linux bundles are affected as well (see: #27937 (moved) for the original Linux bug report).
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information