This is working fairly well on Nightly and Aurora. On Beta (11) soon.

Adding Flash to Firefox was a considerable amount of work. Adobe and Google rather drastically re-wrote NPAPI. The only documentation on how Flash worked on Android is the Android source. This work represents several hundred person hours to get it working.

TBH Flash support is in the current release version has a pref for flash on 2.2 and 2.3 but the experience is rather poor, hence it being disabled with no UI to enable it. about:config change plugin.disable to false. Judge Flash progress against the Nighty or Aurora builds. The Beta 10 or release 10 builds are not representative of the Flash experience for 11+.

Debian tends to have large and historical patches that make large upstream patckages fit the Debain way. For example I'm takling about packages such as OOo/LibreOffice, Apache httpd, Mozilla Firefox, etc. Arch goes in the other direction, make as few changes to the upstream package as possible.

The stock Android browser is not Chrome. It uses Webkit but otherwise the development is completely separate.

The Adobe reader plugin for Mac is a Safari specific plugin. It does not use the standard NPAPI plugin architecture that nearly all other non-IE plugins use.

The dev for pdf-mac stopped updating their code early in the 3.6 release cycle. There is a edit you can do to make the 1.2.0 version run in Firefox 7 but you need to run Firefox in 32 bit mode. http://hints.macworld.com/article.php?story=20110622163401497

If you are experiencing crashes please provide crash ids. https://support.mozilla.com/en-US/kb/Mozilla%20Crash%20Reporter

Please provide crash IDs then. https://support.mozilla.com/en-US/kb/Mozilla%20Crash%20Reporter

Mozilla has no control over Google's toolbar team. If they don't want to support a browser there is nothing Mozilla can do. The Google toolbar is closed source binary extension.

Ubiquity is now a community project. You can find the community updated version at https://bitbucket.org/satyr/ubiquity/downloads

These decisions that may seem random or ill thought out to you have data behind them. A surprisingly large number of people would be happy with a back button, a bookmark menu and a way to bookmark a site. Now these might not be the same users that Firefox has but there are a lot of people who only use those functions.

http://blog.mozilla.com/metrics/2010/04/14/menu-item-usage-study-an-update-to-the-initial-analysis/