I discovered a great website recently that lists 150 popular Firefox extensions and checks if Opera offers the functionality that these extensions add to Firefox as well in some form or another. The main part of Rijks comparison consists of a table that has the 150 most popular (based on the most popular category on the Mozilla Firefox website) Firefox extensions on the left side and one of four possible results for Opera on the right side.
Results can be divided into four different categories each represented by its own color. The dark green category means that Opera has the functionality of the extension built in, green means a comparable add-on is available as a widget or userscript; links are given in this category if this is the case. Light green means the functionality is limited or that advanced customization is needed to achieve the result. Red finally means that there is nothing like that available for Opera as of know.
I did check some of the add-ons that I'm using and most are actually available for Opera as well. Let me list some that are in the dark green category: Video downloader, Faster Fox, Download Statusbar, Tab Mix Plus, Adblock, Session Saver and Linkification. Not much that I would actually be missing if I'd make the switch to Opera.
Update: Please note that the author compared Firefox extensions to Opera widgets, which are fundamentally different in many regards. Opera Software recently has added an extension engine to Opera which is more or less identical to Firefox's implementation of the feature. The widget engine on the other hand will be retired in the near future, so that the comparison will lose much of its usefulness when that is happening.
We have compared the top 10 Firefox and Chrome extensions with Opera extensions, you can check out the comparison with a click on the link above. The website the comparison was published on is no longer available, we have removed the link as a consequence.
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Ghacks is a technology news blog that was founded in 2005 by Martin Brinkmann. It has since then become one of the most popular tech news sites on the Internet with five authors and regular contributions from freelance writers.