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Yes, until recently FVD was my best extension, loved it.  But now, for no reason, open Firefox, boom .... like a new install.  No dials, no history.  Restores easily from a local .sd file, but that backup does not remember my custom dials.  The server restore rarely works the first time.  Have to go in and rename storage to storage.old, then try again.  Boom .. sometimes pops up "turn on remember history" ... but remember history always has been on.  After several attempts eventually the server download works and I am happy once more, use it for weeks, then boom ...gone again.  Note to FVD -- it is not CCleaner that makes FVD reset to default.  Make sure you backup any change !!!!

Find a different speed dial extension.  This one is so unstable, you will learn to hate it.

Same thing again, I start to edit each dial to use a pic from the gallery, then randomly it just stops letting me edit any dial.  The cancel button works, but not the modify.  Also when the mouse cursor moves over a group, it drops down to let you select it.  As long as the mouse button is over the group it stays pulled down.  But not on the main group.  I have to coax the group button to move down by repeatedly moving the mouse cusor on it, until if finally stays down and I can select it.  Often I have to select another group before I can get the main group to work.  Your program has bugs, and I can't keep doing this.  I am now creating bookmarks for my websites as a back-up method when this buggy app keeps failing.

I do use CCleaner, have for years with no affect on FVD Speed Dial.  I just restored Speed Dial, modified my dials manually, got to the last three dials, would not let me modify any more dials.  Then I exited Firefox, re-started, FVD screwed up again.  No dials, like a blank page .  I go to account to restore my dials and a big blue sync logo appears, you can see it says I'm online in the background, but it is frozen, nothing I can do.  Shows I have no back-up, but clearly if I log onto my Everhelper in a new session, everything is there.  This is three times today, and CCleaner has not been used.