Recommendations
Base64 Buffer value change; type about:config, in the url field, set the
base64 value to a number, and enter: 20971520
That equals to; 20 × 1024 × 1024, which is
20,971,520 bytes, or 20 MB.
This increases the Base64 buffer to 20 MB.
With Cloudflare CDN and there R2 buckets, cost is calculated per request, not by file size. A large number of small file requests is less efficient than a single larger request where external files are embedded with Base64.
Using a single file also decrease latency, by shortcutting multiple Request/response cycles, the encoding overhead is offset by modern internet uplinks.
Firefox Dev default value does not load large Base64 background images, except for small Base64 icons.
I am considering turning off image fallback in the future.