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It didn't work with Greasymonkey.
After using Tampermonkey instead, the script got started to work so it should be the fault of previous script manager.
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It didn't work with Greasymonkey.
It didn't work in Firefox 60.0.2 with Greasymonkey 4.4.0. Tried to reload the page and made sure that scripts were installed.
After using Tampermonkey instead, the script got started to work so it should be the fault of previous script manager.