In the year 2012 I switched from using Opera browser to use new Chrome browser. With this change I needed to edit my older Opera extension FlerTop, to be able to use it in the new browser. Fortunately, Chrome extension API is very similar to the Opera one, so it took me only a day to port my extension.
The result is functionaly same extension working under Chrome browser. Extension simply "tops" a product on the fler website, that means it is advertised on the website homepage. And I don't have to take care of it.
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