@sufferingplanet I've found a solution in another thread.
Go to extensions, click Get More Extensions.
Install the Amazon for Opera extension
Now remove the extension youve installed, and the one that added itself also disappears 
Posts made by Bert22
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Opera for computersRE: Permanently disable amazon extension
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Opera for computersRE: Permanently disable amazon extension
and me. Are Amazon paying Opera to spam us with this constantly? I installed Opera, not Amazon, and never gave permission for this extension (and it cannot be removed).
Is our data being sold to Amazon as well? Is there anything in the terms about this?
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Opera for computersRE: Permanently disable amazon extension
How can I stop the various messengers and amazon being auto added to my sidebar on a regular basis? The promos flag doesn't stop this, and there is no setting anywhere I can find. Tried a full fresh install, caused me a lot of hassle having to readd my speed dials manually and amended flags (such as the promo one) and it still keeps happening.
Opera, since you cannot be contacted directly, if you can't assist with this I will be changing to different browser.