Here is a Handy List of Every Serenity/Firefly Comic

Vol. 1- Serenity: Those Left Behind - Written by Brett Matthews / Pencils by Will Conrad

• 3-issue mini-series
• Collected in trade paper-back and hardcover
• Takes place inbetween Firefly and Serenity
• Explains why Book and Inara left Serenity / Hands of Blue guys are back

Vol. 2- Better Days - Written by Brett Matthews / Pencils by Will Conrad

• 3-issue mini-series
• Collected in trade paper-back and hardcover "Better Days and Other Stories" (w/ Float Out, The Other Half, Downtime)
• Takes place inbetween Firefly and Those Left Behind (potentially between episodes of Firefly).
• A heist unusually goes right and the crew fantasize about what they'd do if they got rich.

-Float Out - Written by Patton Oswalt / Pencils by Patric Reynolds

• One-shot
• Three of Wash's old friends reminisce about crazy stunts Wash pulled.

Vol. 3- The Sheperd's Tale - Written by Zack Whedon / Pencils by Chris Samnee

• Original graphic novel
• Tells the story of Sheperd Book, from death to birth.

Vol. 4- Leaves on the Wind - Written by Zack Whedon / Pencils by Georges Jeanty

• 6-issue mini-series
• Collected in hardcover (w/ It's Never Easy)
• Takes place after Serenity.

Vol. 5- No Power in the 'Verse - Written by Chris Roberson / Pencils by Georges Jeanty

• 6-issue mini-series
• Collected in hardcover (w/ The Warrior and the Wind)
• Takes place after Leaves on the Wind

List of Shorts (all from Dark Horse): The Other Half, Downtime, It's Never Easy, The Warrior and the Wind.

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-----------------Everything before this line was published by Dark Horse. Boom Studios acquired the rights this year.

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Firefly Vol. 1- Written by Greg Pak / Pencils by Dan McDaid

• This includes issues 1-4.
• It looks like this series is either ending with issue #4, or taking a break in March 2019.
• Collected in hardcover, which will be released in April 2019.
• Takes place between Firefly and Those Left Behind. ...I think?

-Firefly: Bad Company #1**-** Written by Josh Lee Gordon / Pencils by Francesco Mortarino

• One-shot
• This will apparently be about Saffron.

New Boom Studios Collected Editions:

• Legacy Edition Book One- Those Left Behind, Better Days, Float Out, The Sheperd's Tale, The Other Half, Downtime, It's Never Easy.
• Legacy Edition Book Two- Leaves on the Wind, No Power in the 'Verse, Warrior and the Wind

Other Notable Releases:

• Firefly: Still Flying- Contains 4 short stories written by writers from the show. This is also included in Firefly: A Celebration.
• Firefly: Big Damn Hero- Firefly's first novel. Written by James Lovegrove.
• Firefly: The Magnificent Nine- Novel also written by James Lovegrove. Comes out Mar. 2019.
• Firefly: Generations- Novel by Tim Lebbon. Comes out Oct. 2019.

Order of Release: Those Left Behind > Serenity (the movie) > Better Days > The Other Half > Float Out > Still Flying > Downtime > The Sheperd's Tale > It's Never Easy > Leaves on the Wind > The Warrior and the Wind > No Power in the Verse > Big Damn Hero > The Magnificent Nine > Firefly Vol. 1

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Chronological Order:

1. The Shepherd's Tale (OGN)
2. Fun With Dick and Jayne (from Still Flying)
3. R. Tam Sessions (short Serenity promotional videos)
4. Firefly (the show)
5. Firefly Vol. 1 (new series, unsure about chronological placement)
6. What Holds Us Down (from Still Flying)
7. Downtime (short)
8. Better Days (mini-series)
9. Crystal (from Still Flying)
10. Those Left Behind (mini-series)
11. The Other Half (short)
12. Serenity (the movie)
13. Float Out (one-shot)
14. It's Never Easy (short)
15. Leaves on the Wind (mini-series)
16. The Warrior and the Wind (short)
17. No Power in the 'Verse (mini-series)
18. Take The Sky (from Still Flying)

EDIT: So this didn't really turn out very well on the app. The spacing actually makes sense on the desktop version.