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Best Impromptu Alternatives
Here are some Firefox add-ons that are similar to Impromptu:
off-the-cuff
g650609
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Waiting for a chance
Eric284
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Guinness
iRycicle
3 5.00 (1) 
Something Pensive
TJDowling
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Procrastination
Pink Bear
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Wait for the night.
Shirley
2 4.00 (3) 
Delicious Impulse
Trillende
- 5.00 (1) 
Just Something
pixel
1 0.00 (0) 
sometime
patchy
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Quiet Thought
Tracee
- 4.50 (2) 
prompster
Lucas Aschenbach
77 5.00 (2)