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Dropped support of old versions of Firefox and SeaMonkey.
Added notification to update browser on very old browser versions.
Added notification on YouTube site code change whet it makes unable for addon to add it's button.
- fixed bug 608628;
- fixed gBrowser bug;
- more accurate alerts;
- added "Download from YouTube" to addon menu in Tools menu and App Button menu;
- compatibility fix;
- few small fixes.
- Small button fix.
- initial version.