software/seleniumserver,seleniumrunner: workaround firefox >= 60 font issue
This makes firefox 60 and 68 able to load some fonts and fixes the issue that fonts were rendered as garbled text
Showing
![software/seleniumserver/test/data/test.TestFirefox60.test_screenshot.png](https://lab.node.vifib.com/Tyagov/slapos/-/raw/ba527b82003c9cfdcc5a675b48588f4b59081bad/software/seleniumserver/test/data/test.TestFirefox60.test_screenshot.png)
This makes firefox 60 and 68 able to load some fonts and fixes the issue that fonts were rendered as garbled text
3.18 KB | W: | H:
7.77 KB | W: | H:
6.32 KB | W: | H:
11.3 KB | W: | H: