How can I trigger Firefox memory cleanup from the terminal?

Does anyone know how to initiate the garbage collection and memory reduction in Firefox (about:memory > Free memory > GC/CC/Minimize memory usage) from the terminal? This browser is using way to much RAM and I found that clicking on "Minimize memory usage" actually cuts the load by about 20-30%. Unfortunately, this doesn't last very long, but my idea is to create a Bash script and cron it.