Firefox Quantum 61.0 (64-bit) on Windows 10 probably has a memory leak
I opened a Sacala tutorial page at http://allaboutscala.com/tutorials/chapter-3-beginner-tutorial-using-functions-scala/scala-tutorial-higher-order-function-parameter/ and just sat there for 20 minutes without doing anything else on Firefox or any other browser. I kept watching memory usage for Firefox browser in Windows Task Manager. The memory usage kept increasing from around 500 MB to over 4000 MB in 20 minutes.
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I found the same strange behavior using Microsoft Edge browser on Windows 10 with a similar web page http://allaboutscala.com/big-data/spark/ . However, when the memory usage exceeds 4000 MB (over 95% memory utilization), the web page gets automatically refreshed and the memory usage goes down to around 300 MB. This cycle keeps repeating on Microsoft Edge. With Firefox, the page did not get automatically refreshed.