Considering the competition... Rated 3 out of 5 stars

Well, it's not bursting with features is it? I'd sure like to be able to change the font, and its barring of whole-document search is a pain [must search chapter by chapter, sigh].
On the other hand, user-friendly/ergonomic epub readers are very rare [CoolReader was only tolerable one for me], and it IS free, so i'm grateful for it.

Days later: stopped working. Just get "Connecting...." lockups. Oh well, CoolReader was better anyway.

Simple and works well Rated 4 out of 5 stars

Great. Allows you to read books / EPUB files on your browser, no spyware, no hassle, simple and to the point.

IMO the only things missing are 1) night time reading mode; 2) page number estimate / display and 3) conversion to PDF tool.
Apart from that, the good points: fast and stable; crossplatform; simple GUI and options for changing text size, and has a good library management tool.

Nice, but... Rated 3 out of 5 stars

Doesn't seem to have any way to show page numbers or skip to a specific page. Pretty useless in that regard.

Rated 5 out of 5 stars

A nice addon . It can be used on any operating system (crossplatform)

Rated 5 out of 5 stars

I did not know that this was even possible without installing a separate software

Rated 5 out of 5 stars

our book in a little firefox world; simple wonderful

Rated 5 out of 5 stars

simply does the job and you don't have to download a heavy software. Just about 250 KB.
I wish the fonts were somehow smoother like in pdf viewers.

Rated 5 out of 5 stars

This is great, thank you!!

Rated 5 out of 5 stars

Thanks!

Pretty Good, but....... Rated 3 out of 5 stars

It seems to do a decent job, but 2 caveats so far.
It puts a "catalog" icon to the left of the "Home" icon, and you cannot change it in any way. 2 Problems:
1) This disabled the downloads access (The arrow is gone)
2)The "hotspot" is active even in the full screen mode when the icon is invisible. If you mouse over the hotspot, the screen jumps all over the place.

They're deal breakers for me, but many of you may not care.

Good but... Rated 4 out of 5 stars

I can't find where to change interface language to English

Good for night time reading Rated 5 out of 5 stars

I've been looking for a reader that allowed user choice of background and text colors. I could not find that feature in other readers, such as Adobe Digital Editions and Sumatra PDF. But this one does it! Now I can read in the middle of the night and not wake up my dear wife.

I cannot comment further, but just had to add my thanks for this particular feature.

Rated 5 out of 5 stars

Easy to use and Simple

Rated 5 out of 5 stars

Really handy add on, thank you :)

This review is for a previous version of the add-on (1.4.2.3). 

Good =) Rated 5 out of 5 stars

All GooD!!
but add other files too (fb2, rtf, txt), pleeease =)

This review is for a previous version of the add-on (1.4.2.3). 

Rated 4 out of 5 stars

It definitely does the most basic function. I would definitely like to see improvement on it though such as night-time reading (allowing black bg, white text for easier reading), page numbers included, and perhaps a mobile app it syncs with so that way if I get ahead on my phone, the browser version will not be behind when I switch devices.

This review is for a previous version of the add-on (1.4.2.1). 

Rated 5 out of 5 stars

Absolutely awesome. Should be standard equipment on FireFox.

This review is for a previous version of the add-on (1.4.2.1). 

Rated 5 out of 5 stars

i really like this addon, very simple and does its job well. thanks for it. however i want to make small suggestions. firstly, (in 2-page view) i would like to use mouse wheel to go through pages, it would be helpful. and similarly instead of "del" to open index, can you put a button for mouse. also very minor issue but when a book is open and you click another book, it opens over existing one, a new tab would be better.

This review is for a previous version of the add-on (1.4.2.1). 

Rated 5 out of 5 stars

Very convinient software!

This review is for a previous version of the add-on (1.4.2.1). 

Great Rated 5 out of 5 stars

Very useful... Would be really nice to have search though.

This review is for a previous version of the add-on (1.4.2.1).