Firefox is my favourite browser, but it has some problems. Although the team managed to fix memory leak issues with BigInt in js, but the performance is 3x slower than NodeJS compared to the latest spidermonkey (75.0b6). To test out, I have created a simple pi calculator (open source), the website is: http://picalc.rf.gd/ The source code can be found on github, or just by clicking the "View Page Source". It seems impossible to get past 4,000 digits of Pi in firefox but in chromium I can calculate about 10,000 digits in the time firefox does 4,000 digits. Previously, in the earlier versions (73 I guess), the memory went all the way up to 4 gigabytes while trying to calculate 5,000 digits, it's now (my current firefox version is 75.0b4, developer edition). For the benchmarks, I have also tried NodeJS and Firefox's Spidermonkey.