Add bookmarks to Delicious and Google Bookmarks at the same time
Solution 1:
Use the Delicious addon
https:// addons.mozilla.org/en-US/firefox/addon/3615
This will install toolbar and sidebar. Toolbar has limited use. But Sidebar is very useful as it allows instant tag search along with nested tags. It integrates with firefox , so that when u click on the bookmark star , it asks to save to delicious in a nice dialog box with recommended & popular tags.
Install GMarks 1.0.1
https://addons.mozilla.org/en-US/firefox/addon/2888
GMarks helps you sync & manage your EDIT:firefox bookmarks with Google Bookmarks
EDIT: When you want to save a bookmark Click on the default firefox bookmark button(star) . Since you have the Official Delicious Addon installed it will ask whether you want to save to Delicious also?. Click yes and it will asks you to save to in a dialog box with recommended & popular tags.
Now you have bookmarks in both Delicious & Firefox(Browser Bookmarks) . Use GMarks to sync to Google Bookmarks.
How do you suppose 1 click will work? I usually tag bookmarks in delicious with the popular & recommended tags to help them sort it out
Alternatively i use Google Toolbar. It has a button for adding Bookmarks. Position it close to the Firefox star and you won't have to move your mouse too much. It's not 1 click though