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It's quite easy to install Firefox as a sort of a portable app in Debian.
Sort of like downloading a zipped version of Firefox in Windows and extracting it to a folder.
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In KDE the steps are:
A. Visit -
http://www.mozilla.com/en-US/firefox/personal.html
And you should see something like:
Upgrade Your Firefox
3.5.2, English (US), Linux (9.4MB)
Download Now - Free
And it will ask you to download "firefox-3.5.2.tar.bz2"
B. Download it into your home folder.
C. Launch the file and it should load in Konqueror and show a firefox folder. Right click on the folder name and select [COPY-TO] - [HOME FOLDER] - [COPY HERE]. This will create a /firefox folder under your home account.
D. Change over to the firefox folder and select the Tree view.
E. Look for the file named "firefox" that shows the "File Type" as "Shell Script". Click it and that's all it takes.
There is one bummer however - The only problem doing it this way is this is per user account. Each and every user will have to do these same steps in their own home directory.
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As far as putting a shortcut to the file on the KDE desktop the steps are:
1. Right Click on the KDE desktop and select.
A. Create New - Link to Application
B. On the [General Tab] type Firefox
C. On the [Application Tab]
A. Description: Firefox
B. Command: Either Browse to the shell script or key it is as something like '/home/username/firefox/firefox'
Note: The single quotes are required!
C. Work Path: /home/username/firefox
2. Note at this point it's icon will be the Gear. To change it to a Firefox icon do these steps.
A. Click on the Icon in the [General Tab]
B. Click [Other Icons] and [Browse]
C. Click in the [Icons] Folder and select your favorite.
Personally I selected 'mozicon128.png" because I like my icons huge.
3. Save it and you are good to go.