diff --git a/defaults.lua b/defaults.lua
index 4a0ffd962..85feb4ad1 100644
--- a/defaults.lua
+++ b/defaults.lua
@@ -88,8 +88,8 @@ DCREREADER_CONFIG_DEFAULT_FONT_SIZE = 22    -- default font size
 -- crereader margin sizes
 -- margin {left, top, right, bottom} in pixels
 DCREREADER_CONFIG_MARGIN_SIZES_SMALL = {5, 10, 5, 10}
-DCREREADER_CONFIG_MARGIN_SIZES_MEDIUM = {20, 15, 20, 15}
-DCREREADER_CONFIG_MARGIN_SIZES_LARGE = {25, 20, 25, 20}
+DCREREADER_CONFIG_MARGIN_SIZES_MEDIUM = {10, 15, 10, 15}
+DCREREADER_CONFIG_MARGIN_SIZES_LARGE = {20, 20, 20, 20}
 
 -- gesture detector defaults
 DGESDETECT_DISABLE_DOUBLE_TAP = true
diff --git a/frontend/document/credocument.lua b/frontend/document/credocument.lua
index 688bcd10e..f7173c1f9 100644
--- a/frontend/document/credocument.lua
+++ b/frontend/document/credocument.lua
@@ -324,6 +324,7 @@ end
 function CreDocument:register(registry)
 	registry:addProvider("txt", "application/txt", self)
 	registry:addProvider("epub", "application/epub", self)
+	registry:addProvider("fb2", "application/fb2", self)
 	registry:addProvider("html", "application/html", self)
 	registry:addProvider("htm", "application/htm", self)
 	registry:addProvider("zip", "application/zip", self)
diff --git a/frontend/ui/reader/readerlink.lua b/frontend/ui/reader/readerlink.lua
index 9e135fed3..9b6701680 100644
--- a/frontend/ui/reader/readerlink.lua
+++ b/frontend/ui/reader/readerlink.lua
@@ -53,10 +53,14 @@ function ReaderLink:onTap(arg, ges)
 		local pos = self.view:screenToPageTransform(ges.pos)
 		for i = 1, #self.view.links do
 			local link = self.view.links[i]
+			-- enlarge tappable link box
 			local lbox = Geom:new{
-				x = link.start_x, y = link.start_y,
-				w = link.end_x - link.start_x,
-				h = link.end_y - link.start_y > 0 and link.end_y - link.start_y or 30,
+				x = link.start_x - Screen:scaleByDPI(15),
+				y = link.start_y - Screen:scaleByDPI(15),
+				w = link.end_x - link.start_x + Screen:scaleByDPI(30),
+				h = link.end_y - link.start_y > 0 
+				        and link.end_y - link.start_y + Screen:scaleByDPI(30) 
+				        or Screen:scaleByDPI(50),
 			}
 			if inside_box(pos, lbox) then
 				DEBUG("goto link", link)
diff --git a/frontend/ui/reader/readerscreenshot.lua b/frontend/ui/reader/readerscreenshot.lua
index 963a09b73..e2f2db553 100644
--- a/frontend/ui/reader/readerscreenshot.lua
+++ b/frontend/ui/reader/readerscreenshot.lua
@@ -1,4 +1,5 @@
 local InputContainer = require("ui/widget/container/inputcontainer")
+local Device = require("ui/device")
 local Screen = require("ui/screen")
 local GestureRange = require("ui/gesturerange")
 local UIManager = require("ui/uimanager")
diff --git a/koreader-base b/koreader-base
index d73713f8b..6284768bc 160000
--- a/koreader-base
+++ b/koreader-base
@@ -1 +1 @@
-Subproject commit d73713f8b88acf02c6eb6057363e7a42586862a5
+Subproject commit 6284768bc3e317385164e9955837ac75265ffd1d