hello i update opera to 51.0.2 I noticed that there is something wrong with it. The icon(loading top). It is very bad. It is similar to the old version of Firefox. I hope to change it soon.
https://i.imgur.com/oBBk9rR.png

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hey ...i was same but i fixed just dowland this
https://addons.opera.com/en/extensions/details/download-chrome-extension-9/
after that
install this download manager
https://chrome.google.com/webstore/detail/download-plus/gokgophibdidjjpildcdbfpmcahilaaf?hl=en
restart browser

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sorry opera dispensed customization firfox The only one that can be customized

update your browser

hey i have same probleme but i install theme arc xfce is working fine