[rb] Don't create `caps[:firefox_options]` unless needed
[rb] Don't create `caps[:firefox_options]` unless needed

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Ardesco/selenium,valfirst/selenium,markodolancic/selenium,Ardesco/selenium,twalpole/selenium,SeleniumHQ/selenium,bayandin/selenium,oddui/selenium,DrMarcII/selenium,HtmlUnit/selenium,asashour/selenium,DrMarcII/selenium,kalyanjvn1/selenium,twalpole/selenium,davehunt/selenium,jsakamoto/selenium,Ardesco/selenium,jsakamoto/selenium,markodolancic/selenium,jabbrwcky/selenium