Superb! No need for currency conversion. Rated 5 out of 5 stars

Hello, I read your plans for future features. Your add-on is a very useful tool for daily work at the computer. And I think that currency conversion is not necessary, because there exists an add-on that does this very well. People who also want currency conversion can install this in addition:

https://addons.mozilla.org/en-US/firefox/addon/7908

Your add-on is the perfect solution for people who only want unit conversion. And I think it should do only this and nothing else. Keep your add-on lightweight! I recommend to drop programming on the complicated currency thing and concentrate on maintenance of the unit conversion and its options.

Also, I'm always a little bit touched when I read how much time and love people invest into things like this and then share it for free with others. Sharing is what brings progress and prosperity for all. In case you ever decide to drop it due to lack of time or whatever, please ask the community if there's someone who will take the project and maintain it. I'm sure there will always be people who can do the job. Thank you for all your work. If everyone would share his productivity as you do, this world would be a very delightful place for everyone on this planet.

Regards

This review is for a previous version of the add-on (0.8.6). 

Everything's relative

Thank you for your kind words, Paul!

Regarding your option against currency conversions, I'm not sure I want to drop it. I'm a purist myself when it comes to small utilities like Firefox add-ons, in that I completely agree they should do one thing, and do it well. But I see the Converter's purpose differently than you: you seem to see it as a unit converter -- I see it as a contextual converter. Where you see strength in unit conversion specifically, I see strength in contextual conversions in general. Not to mention that, in a broad enough sense, currency conversion IS unit conversion -- the simple fact that the units happen to be monetary units instead of physical units is just a technicality.

Regarding your appreciation for free software, you'd be surprised how good a motivator money can be, even in this context. The sheer lack of donations is probably the number one factor for the code quality, development speed and/or maintenance quality of many pieces of free software (read "lack of code quality, etc."). In fact this is a hotly debated topic among many coders writing free software: how to monetize it. And I don't mean making a fortune out of it, I mean getting *something* in return -- the way I see it, ideally a hobby project should be able to finance another (reasonably inexpensive) hobby. For instance writing free code should be able to finance buying a couple of lenses a year for hobbyist photographers; conversely, if your "main" hobby was photography then it should be able to finance buying the necessary software, or printer, or whatever. And so on. Ironically, most hobbies (including programming in general) can produce a modest revenue stream -- but writing free software does not, more than 99% of the time.

At any rate, thank you for your interest and, more importantly, thank you for taking the time to share your ideas and appreciation!