Tested configurations:
- browser with WASM support (Firefox 68.0.2)
- creates paste with zlib compression, no password
- creates paste with zlib compression, with password
- reads paste with zlib compression, no password
- reads paste with zlib compression, with password + retry button works
- reads paste without compression, no password
- reads paste without compression, with password + retry button works
- browser without WASM support (Chromium 76.0.3809.100, started via `chromium-browser --js-flags=--noexpose_wasm`)
- creates paste without compression, no password, but shows WASM warning
- creates paste without compression, with password, but shows WASM warning
- fails to read paste with zlib compression, no password + shows WASM error
- fails to read paste with zlib compression, with password + shows WASM error
- reads paste without compression, no password
- reads paste without compression, with password + retry button works