diff --git a/html/General/Thread-catalog-view.html b/html/General/Thread-catalog-view.html
index 1df9afccb..2a18fa150 100644
--- a/html/General/Thread-catalog-view.html
+++ b/html/General/Thread-catalog-view.html
@@ -1,4 +1,4 @@
-<a href="/#{thread.board}/thread/#{thread.ID}" class="thumb"></a>
+<a href="#{Build.path thread.board.ID, thread.ID}" class="thumb"></a>
 <div class="thread-stats" title="Post count / File count / Page count">
   <span class="post-count">#{postCount}</span> / <span class="file-count">#{fileCount}</span> / <span class="page-count">#{pageCount}</span>
   <span class="thread-icons"></span>
diff --git a/src/General/Build.coffee b/src/General/Build.coffee
index 20a03e56b..0e5c3098c 100644
--- a/src/General/Build.coffee
+++ b/src/General/Build.coffee
@@ -15,6 +15,11 @@ Build =
   thumbRotate: do ->
     n = 0
     -> n = (n + 1) % 2
+  path: (boardID, threadID, postID, fragment) ->
+    path  = "/#{boardID}/thread/#{threadID}"
+    path += "/#{g.SLUG}" if g.SLUG? and threadID is g.THREADID
+    path += "##{fragment or 'p'}#{postID}" if postID
+    path
   postFromObject: (data, boardID) ->
     o =
       # id
@@ -175,7 +180,7 @@ Build =
     if isOP and g.VIEW is 'index'
       pageNum   = Index.liveThreadIDs.indexOf(postID) // Index.threadsNumPerPage + 1
       pageIcon  = " <span class=page-num title='This thread is on page #{pageNum} in the original index.'>Page #{pageNum}</span>"
-      replyLink = " &nbsp; <span>[<a href='/#{boardID}/thread/#{threadID}' class=replylink>Reply</a>]</span>"
+      replyLink = " &nbsp; <span>[<a href='#{Build.path boardID, threadID}' class=replylink>Reply</a>]</span>"
     else
       pageIcon = replyLink = ''
 
@@ -203,12 +208,12 @@ Build =
           ' </span> ' +
           "<span class=dateTime data-utc=#{dateUTC}>#{date}</span> " +
           "<span class='postNum'>" +
-            "<a href=#{"/#{boardID}/thread/#{threadID}#p#{postID}"} title='Highlight this post'>No.</a>" +
+            "<a href=#{Build.path boardID, threadID, postID} title='Highlight this post'>No.</a>" +
             "<a href='#{
               if g.VIEW is 'thread' and g.THREADID is threadID
                 "javascript:quote(#{postID})"
               else
-                "/#{boardID}/thread/#{threadID}#q#{postID}"
+                Build.path boardID, threadID, postID, 'q'
               }' title='Quote this post'>#{postID}</a>" +
             pageIcon + sticky + closed + replyLink +
           '</span>' +
@@ -220,11 +225,11 @@ Build =
 
       '</div>'
 
+    # Fix quote pathnames in index or cross-{board,thread} posts
     for quote in $$ '.quotelink', container
       href = quote.getAttribute 'href'
-      continue if href[0] is '/' # Cross-board quote, or board link
-      href = "#{threadID}#{href}" if href[0] is '#'
-      quote.href = "/#{boardID}/thread/#{href}" # Fix pathnames
+      continue unless href[0] is '#'
+      quote.href = Build.path boardID, threadID, href[2..]
 
     container
 
@@ -236,7 +241,7 @@ Build =
     $.el 'a',
       className: 'summary'
       textContent: text.join ' '
-      href: "/#{boardID}/thread/#{threadID}"
+      href: Build.path boardID, threadID
   thread: (board, data) ->
     Build.spoilerRange[board] = data.custom_spoiler
 
diff --git a/src/General/Main.coffee b/src/General/Main.coffee
index 5b61ccacb..e464f91fb 100644
--- a/src/General/Main.coffee
+++ b/src/General/Main.coffee
@@ -14,6 +14,7 @@ Main =
       return
     if g.VIEW is 'thread'
       g.THREADID = +pathname[3]
+      g.SLUG = pathname[4] if pathname[4]?
 
     # flatten Config into Conf
     # and get saved or default values
diff --git a/src/Miscellaneous/Keybinds.coffee b/src/Miscellaneous/Keybinds.coffee
index 45580ee4d..51a5e1e6b 100644
--- a/src/Miscellaneous/Keybinds.coffee
+++ b/src/Miscellaneous/Keybinds.coffee
@@ -187,7 +187,7 @@ Keybinds =
 
   open: (thread, tab) ->
     return if g.VIEW isnt 'index'
-    url = "/#{thread.board}/thread/#{thread}"
+    url = Build.path thread.board.ID, thread.ID
     if tab
       $.open url
     else
diff --git a/src/Posting/QR.coffee b/src/Posting/QR.coffee
index 551a3da41..5d3a9f2ca 100644
--- a/src/Posting/QR.coffee
+++ b/src/Posting/QR.coffee
@@ -587,9 +587,9 @@ QR =
     QR.cooldown.set {req, post, isReply, threadID}
 
     URL = if threadID is postID # new thread
-      "/#{g.BOARD}/thread/#{threadID}"
+      Build.path g.BOARD.ID, threadID
     else if g.VIEW is 'index' and !QR.cooldown.auto and Conf['Open Post in New Tab'] # replying from the index
-      "/#{g.BOARD}/thread/#{threadID}#p#{postID}"
+      Build.path g.BOARD.ID, threadID, postID
     if URL
       if Conf['Open Post in New Tab']
         $.open URL
diff --git a/src/Quotelinks/QuoteBacklink.coffee b/src/Quotelinks/QuoteBacklink.coffee
index 03e11b980..d5a4ea67f 100644
--- a/src/Quotelinks/QuoteBacklink.coffee
+++ b/src/Quotelinks/QuoteBacklink.coffee
@@ -49,7 +49,7 @@ QuoteBacklink =
   buildBacklink: (quoted, quoter) ->
     frag = QuoteBacklink.frag.cloneNode true
     a = frag.lastElementChild
-    a.href = "/#{quoter.board}/thread/#{quoter.thread}#p#{quoter}"
+    a.href = Build.path quoter.board.ID, quoter.thread.ID, quoter.ID
     a.textContent = text = QuoteBacklink.funk quoter.ID
     if quoter.isDead
       $.addClass a, 'deadlink'
diff --git a/src/Quotelinks/Quotify.coffee b/src/Quotelinks/Quotify.coffee
index d3866921e..b6c997d5d 100644
--- a/src/Quotelinks/Quotify.coffee
+++ b/src/Quotelinks/Quotify.coffee
@@ -40,7 +40,7 @@ Quotify =
       # Don't add 'deadlink' when quotifying in an archived post,
       # and we don't know if the post died yet.
       a = $.el 'a',
-        href: "/#{boardID}/thread/#{post.thread}#p#{postID}"
+        href: Build.path boardID, post.thread.ID, postID
         className: if post.isDead then 'quotelink deadlink' else 'quotelink'
         textContent: quote
       $.extend a.dataset, {boardID, threadID: post.thread.ID, postID}