makePrefjs doesn't properly escape strings

[AshesITR]

This piece of code isn't enough to provide valid JS for character options:

https://github.com/ropensci/RSelenium/blob/c11dd6922aedd654a2680e7737c63ce534e7c9ce/R/util.R#L288

This bug manifests e.g. when setting the download directory in windows:

RSelenium::makeFirefoxProfile(list(browser.download.dir = "C:\\Downloads"))

The result is that the preferences aren't correctly set up, as you can manually check in the Selenium window by examining about:config.

I currently work around this issue by escaping the string for use in JS source code before passing it to RSelenium, but it would be nice if that weren't necessary.

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Possible remedy: Using deparse(unname(...)) instead of dQuote should work. I have not tested this though.
Here is some info about what needs escaping: https://www.freeformatter.com/javascript-escape.html

[brshallo]

Perhaps this is causing the problems indicated here: https://stackoverflow.com/questions/35551711/specify-download-folder-in-rselenium-does-not-work

And here: https://stackoverflow.com/questions/53091783/cant-set-download-directory-with-rselenium-firefox