how to install two firefoxs in ubuntu 11.04

Firefox 5 is out now. My ubuntu has updated Firefox Browser to 5, and it works fine, and I do feel it's faster, but the problem is that some add-ons does not work in the new Firefox. If this is a case for you too, or you just like to have old Firefox in your machine, here is how I did it. 1. Go to Mozilla Old download page at http://www.mozilla.com/en-US/firefox/all-older.html, and pick one and download it. 2. Unzip the file and save it to somewhere, says, /home/adam/firefox. 3. Close the existing firefox, and at your command line, change directory to firefox folder, and then enter the following command

./firefox &

Note that you have close exiting Firefox, otherwise, it will trigger the Firefox 5 not Firefox 3. And you can click the file named firefox to open it, but you have to select RUN, not open it in the text editor.

Links is forced to open in a new window

All HTML links with target="_blank" usually means open in a new window. Some modern browser can open them in a new tab, which is one of enhancements that make Firefox famous.

But recently, the links of the page are forced to open in a new window other tan a new tab in my Firefox browser, although I have set it to open in a new tab in the Tools->option-tab.

I tried to Goolge an answer, but found nothing. Finally, I found the reason.

Try enter ‘about:config’ on your Firefox browser address bar, you will see a long list, type in ‘link’ in the Filter, you will see, below two parameters,

browser.link.open_newwindow and browser.link.open_newwindow.restriction

The default value of these two parameters are 3 and 2. But they were 1 and 1 on my browser.

browser.link.open.newwindow = 1 means open All HTML links with target="_blank" in a new tab, but it only work when browser.link.open_new.restriction = 2.