vista或win7才能有透明效果吧……

STEP 1: First download the theme using following link:
Download Mozilla Firefox 3.7 Theme
Its a ZIP file. Extract it using WinRAR or 7-Zip (both can be found in our "Downloads" section). You'll get a .ZAR file which contains the actual theme. Drag-n-drop this file to "Add-ons" window in Firefox and it'll install the theme.
STEP 2: You'll also need to install the "All Glass Firefox" add-on to get the Glass effect which can be found here.
STEP 3: If you also want to get the "Tools" button near "Searchbox" as shown in the screenshot, install "Personal Menu" add-on using following link:
Install Personal Menu
It'll add the "Tools" button near searchbox. Now right-click on empty area near addressbar or searchbox and select "Customize" option. Now drag "Bookmarks" button between searchbox and Tools button.
Now go to "Tools -> Add-ons -> Extensions" menu and select "Personal Menu" from the list. Click on "Options" button and go to "Advanced" Tab. Enable "Hide Drop-Marker" option. Also enable "Hide Menus Toolbar" and "Show temporarily by pressing ALT key" options to hide menubar.
STEP 4: If you face problem while reading text on inactive tabs, you'll need to apply the code given in "newtabfix.txt" present in the downloaded ZIP file using "Stylish" add-on.
Install Stylish
Once installed, copy the code from TXT file, click on the "Stylish" icon present in Statusbar and select "Write new style -> Blank style" option. Now paste the code in text area. Provide a suitable name to the style and click on "Save" button. That's it.
After following these steps, you'll enjoy the same interface in your favorite browser.