Storing HAR triggers `Object.throwDecodedError` for several sites.

[happywhitelake]

Browsertime uses har-export-trigger to export HAR. I could export the HAR file when visiting some common sites: google.com, facebook.com, etc. But, I currently encounter Object.throwDecodedError when crawling some specific sites, such as: http://www.team.aero, http://bilimselbilisim.com, and http://jmlsg.org.uk. Note that all of these sites can be viewed/rendered normally in real Firefox browser.

The errors are shown as:

at Object.throwDecodedError (/usr/src/app/node_modules/selenium-webdriver/lib/error.js:550:15)
at parseHttpResponse (/usr/src/app/node_modules/selenium-webdriver/lib/http.js:560:13)
at Executor.execute (/usr/src/app/node_modules/selenium-webdriver/lib/http.js:486:26)
at process._tickCallback (internal/process/next_tick.js:68:7)

Original bug was filed here: https://github.com/sitespeedio/browsertime/issues/636#issuecomment-544894687