I would take this question over to Mozilla.org and not here at askubuntu.com except for the following:
This is a brand new install of Ubuntu, Firefox and Thunderbird.
On the same computer I also have band new installs of Firefox and Thunderbird for the Wondows7 partition. And they are running perfectly.
One of the Firefox lockups is totally reproducible.
Irritatingly, when I click a link in an application (I use Quassel), firefox opens the default start page.
I have a somewhat non-standard configuration setup. I am using a nightly build of firefox, where the binary is located at /opt/nightly/firefox. I have a symbolic link from /usr/bin/firefox -> /opt/nightly/firefox. I have Ubuntu 11.04, using Gnome with Docky.
Some webpages contain email links. If you right-click on the link in most Web browsers, a menu appears that lets you copy the email address to the clipboard (first screenshot). You can then paste the address into the To field of a new email message.
In recent versions of Mozilla's Firefox browser, you can also left-click on the link and get some action.
If thunderbird won't open a link, either by clicking on the link or right click > open link in browser, these posts might help:http://chakra-project.org/bbs/viewtopic.php?id=4724I didn't create that topic, so I couldn't edit the topic subject to reflect the solution.
I've installed Seamonkey 2.14.1 via Ubuntuzilla, but I can't seem to figure out how to make it the default Mail and Web clients. If I click on a web link in the Seamonkey News or Mail reader it launches the link in Seamonkey as I'd expect. However, if I click on a link outside of Seamonkey, it'll launch Google Chrome (which somehow made itself my default browser).