An OPTION that allows users to unload tabs/groups out of ram memory onto the hard drive when they haven't been viewed for a specified amount of time, is i think really important.

This would allow Firefox to be extremely fast all the time, especially if it is programmed in such a way that those tabs and groups that are on the hard drive cache get ZERO CPU time and are invisible until the user views them again, in which case they get pulled back into ram.

This would allow dozens, hundreds of tabs to run smoothly. I have quite a lot of tabs running all the time, and even on my i5 core high spec pc, Firefox can become slightly jerky in it's response if i go overboard, say 200+ tabs - i know that's a lot, but people multitask and from one site you end up opening so many tabs.

Ideally background tabs/groups should get zero CPU time and only the focussed tab should get it, but i imagine that's really difficult when websites use so many scripts, flash, etc.

If you could have an option which would turn a feature similar to this on that would be dope.
My idea was that any links that you choose to open in a new tab would go into a group which that tab already existed in or create a new group for that tab. I then thought it if you could turn that tab into a drop down (select box) which would contain all the other tabs in that group that would make having multiple groups open at once possible.

Provide search box to quickly locate tabs based on match in page title or URL. Highlight them and provide an option to create group from the matches.

These search groups could potentially be saved to work as Smart Playlists in iTunes or like saved Search Folders (from Bookmarks / History) in Firefox's Library.

Please add Undo (and Redo) support to tab manipulation. Sometimes I mess-up my carefully positioned layout by accident. Same goes for closing individual tabs and groups of tabs - this should be reversible action. Currently you can restore closed tabs with Ctrl+Shift+T, but they loose the grouping and you are forced to leave the TabCandy view. What I mean is for Undo/Redo to work directly in TC view.

Since installing TabCandy associates the cmd+1 shortcut with the TabCandy interface, it seems intuitive to move the launching button to the far left of the tab bar. It should look like a small tab button (kind of like the New Tab button?), and it would behave like the first tab in the window. The first actual tab would be numbered 2, and the next is 3, and so on (It seems that this is already the current behavior). It would make the cmd+1 shortcut make more sense, and give a physical space where the TabCandy interface can sit.

I hope this signals the merging of these two concepts. Really, for me, bookmarks are a place where websites go to die and I use tabs like i would imagine bookmarks were intended for: keeping track of ideas i want to keep as a reminder. Tree Style Tabs allows me to organize those ideas in ways that would be too time consuming to replicate with bookmarks.

Watching that demo made me realize that the two concepts should be merged into one. The TabCandy concept seems to be a great way of accomplishing this.

The only suggestion I have is to move older tab groups out of memory, either after a set time, set usage of memory, manually, or better yet: all the above.

Tab candy is a great idea but what would be even better if it was already integrated to the tab bar. What I mean is that the ability to group and organize would be aready in tab bar and groups would appear next to open tabs. I even made a picture of my idea.
http://www.notionbug.com/for_better_tab_candy.jpg
Something really simple but I think it's enough to give you the idea.
There you can see there are four groups. Three of them are collapsed and one expanded.
- When hovering on a group it shows (maybe?) vertically what tabs are in that group.
- When clicking on a group it expands and the previous group collapses.
- Ability to drag&drop tabs from current group to other group.
- Ability to hide groups to tab candy page.
- Ability to organaize everything in tab candy page (well thats already there :D).
- Maybe automatically makeing a new group when opening a number of new tabs from one webpage (for example when on Google search opening all results from page one).
- Grouping selected tabs... if there would be the ability to select tabs?

Lastly... I don't know if it's in the right place to ask it but I hope there's a way to reduce memory consumption because if that many tabs are open at the same time then usually firefox consumes a lot of memory. Even though I have 6gb mem with i7 the huge memory consumption still increases the chance of firefox craching. It's almost always on top of the memory consumtion list on my PC with 878 532K (I have surfed internet all day and currently have over 20 tabs open) and the second place on mem consumption is svchost.exe with 134 184K.
I know it might be maybe some addons fault or something, I don't know and when I restart firefox it's normal and again but still it's problem till I don't restart it.
I found "AFOM addon" for this and I'll try it right now to see how it works but I don't know if that's the best solution.

Tab candy should have keyboard shortcuts like this:

1: [ALT]+[~] = Open tab candy

2: [CTRL]+[1 or 2 ... or 9 ] = Go to tab 1 or 2 ... or 9 in current tab group

3: [CTRL]+[0] = Show input window and go to tab in current group, that you type. It can be even tab nr. 299. in current group.

4: [Shift]+[~] = Next tab group

5: [CTRL]+[~] = Previous tab group

6 [CTRL]+[Shift] = New tab group

6: [CTRL]+[Shift]+[1 or 2 ... or 9 ] = Go to group 1 or 2 ... or 9.

7: [CTRL]+[Shift]+[0] = Show input window and go to group that you type in.

8: [CTRL]+[Shift]+[ALT]+[1 - 9] = Move curent tab to group 1 -9

9: [CTRL]+[ALT]+[1 - 9] = Save and close group 1 - 9

And more like this...
Every shortcut should be customizable with option to even disable it.

Hierarchy: The one thing that immediately occurs to me that some
people will consider really important and others won't care about at
all is the ability to have groups within groups (where subgroups are
top-level objects). So you can zoom in on a group, which will give a
top-level workspace and zoom out ad infinitum.

I also imagine that TabCandy and bookmarks becoming much the same thing.

I like how the panel opens but sometimes i dont want to open that huge panel. I was hoping maybe if we right click on that button that opens the big panel with all tabs, it just slides down the tab bar and we see rows of our tabs. They should of course be grouped, maybe like could share a common background color. And then when I click on a tab it will make that tab selected and the tab bar that was slid open to be wide now slides back up to one row and shows the row of the group of tabs that the current tab is in. I think this would be awesome!