diff --git a/modules/context/context.go b/modules/context/context.go
index c6597cf024..2e43088ff8 100644
--- a/modules/context/context.go
+++ b/modules/context/context.go
@@ -345,6 +345,8 @@ func Contexter() macaron.Handler {
 		ctx.Data["EnableOpenIDSignIn"] = setting.Service.EnableOpenIDSignIn
 		ctx.Data["DisableMigrations"] = setting.Repository.DisableMigrations
 
+		ctx.Data["ManifestData"] = setting.ManifestData
+
 		c.Map(ctx)
 	}
 }
diff --git a/modules/setting/setting.go b/modules/setting/setting.go
index 63ae15af97..290ec94c44 100644
--- a/modules/setting/setting.go
+++ b/modules/setting/setting.go
@@ -8,6 +8,7 @@ package setting
 import (
 	"encoding/base64"
 	"fmt"
+	"html/template"
 	"io"
 	"io/ioutil"
 	"math"
@@ -293,6 +294,8 @@ var (
 	CSRFCookieName     = "_csrf"
 	CSRFCookieHTTPOnly = true
 
+	ManifestData template.URL
+
 	// Mirror settings
 	Mirror struct {
 		DefaultInterval time.Duration
@@ -642,6 +645,8 @@ func NewContext() {
 		LandingPageURL = LandingPageHome
 	}
 
+	ManifestData = makeManifestData()
+
 	if len(SSH.Domain) == 0 {
 		SSH.Domain = Domain
 	}
@@ -1040,6 +1045,14 @@ func loadOrGenerateInternalToken(sec *ini.Section) string {
 	return token
 }
 
+func makeManifestData() template.URL {
+	name := url.QueryEscape(AppName)
+	prefix := url.QueryEscape(StaticURLPrefix)
+	subURL := url.QueryEscape(AppSubURL) + "/"
+
+	return template.URL(`data:application/json,{"short_name":"` + name + `","name":"` + name + `","icons":[{"src":"` + prefix + `/img/logo-lg.png","type":"image/png","sizes":"880x880"},{"src":"` + prefix + `/img/logo-sm.png","type":"image/png","sizes":"120x120"},{"src":"` + prefix + `/img/logo-512.png","type":"image/png","sizes":"512x512"},{"src":"` + prefix + `/img/logo-192.png","type":"image/png","sizes":"192x192"}],"start_url":"` + subURL + `","scope":"` + subURL + `","background_color":"%23FAFAFA","display":"standalone"}`)
+}
+
 // NewServices initializes the services
 func NewServices() {
 	InitDBConfig()
diff --git a/routers/admin/admin.go b/routers/admin/admin.go
index d0f027f5f8..4180076b08 100644
--- a/routers/admin/admin.go
+++ b/routers/admin/admin.go
@@ -39,10 +39,6 @@ const (
 	tplQueue     base.TplName = "admin/queue"
 )
 
-var (
-	startTime = time.Now()
-)
-
 var sysStatus struct {
 	Uptime       string
 	NumGoroutine int
@@ -85,7 +81,7 @@ var sysStatus struct {
 }
 
 func updateSystemStatus() {
-	sysStatus.Uptime = timeutil.TimeSincePro(startTime, "en")
+	sysStatus.Uptime = timeutil.TimeSincePro(setting.AppStartTime, "en")
 
 	m := new(runtime.MemStats)
 	runtime.ReadMemStats(m)
diff --git a/routers/routes/macaron.go b/routers/routes/macaron.go
index 170bc7d493..16977b9470 100644
--- a/routers/routes/macaron.go
+++ b/routers/routes/macaron.go
@@ -6,12 +6,10 @@ package routes
 
 import (
 	"encoding/gob"
-	"net/http"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/auth"
 	"code.gitea.io/gitea/modules/context"
-	"code.gitea.io/gitea/modules/httpcache"
 	"code.gitea.io/gitea/modules/lfs"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/options"
@@ -977,13 +975,6 @@ func RegisterMacaronRoutes(m *macaron.Macaron) {
 		private.RegisterRoutes(m)
 	})
 
-	// Progressive Web App
-	m.Get("/manifest.json", templates.JSONRenderer(), func(ctx *context.Context) {
-		ctx.Resp.Header().Set("Cache-Control", httpcache.GetCacheControl())
-		ctx.Resp.Header().Set("Last-Modified", setting.AppStartTime.Format(http.TimeFormat))
-		ctx.HTML(200, "pwa/manifest_json")
-	})
-
 	// Not found handler.
 	m.NotFound(routers.NotFound)
 }
diff --git a/templates/base/head.tmpl b/templates/base/head.tmpl
index 51d60c46f8..99b942bcf4 100644
--- a/templates/base/head.tmpl
+++ b/templates/base/head.tmpl
@@ -5,7 +5,7 @@
 	<meta name="viewport" content="width=device-width, initial-scale=1">
 	<meta http-equiv="x-ua-compatible" content="ie=edge">
 	<title>{{if .Title}}{{.Title | RenderEmojiPlain}} - {{end}} {{if .Repository.Name}}{{.Repository.Name}} - {{end}}{{AppName}} </title>
-	<link rel="manifest" href="{{AppSubUrl}}/manifest.json" crossorigin="use-credentials">
+	<link rel="manifest" href="{{.ManifestData}}"/>
 	<meta name="theme-color" content="{{ThemeColorMetaTag}}">
 	<meta name="default-theme" content="{{DefaultTheme}}" />
 	<meta name="author" content="{{if .Repository}}{{.Owner.Name}}{{else}}{{MetaAuthor}}{{end}}" />
diff --git a/templates/pwa/manifest_json.tmpl b/templates/pwa/manifest_json.tmpl
deleted file mode 100644
index 7eba1f45bb..0000000000
--- a/templates/pwa/manifest_json.tmpl
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  "short_name": "Gitea",
-  "name": "Gitea - Git with a cup of tea",
-  "icons": [
-    {
-      "src": "{{StaticUrlPrefix}}/img/logo-lg.png",
-      "type": "image/png",
-      "sizes": "880x880"
-    },
-    {
-      "src": "{{StaticUrlPrefix}}/img/logo-sm.png",
-      "type": "image/png",
-      "sizes": "120x120"
-    },
-    {
-      "src": "{{StaticUrlPrefix}}/img/logo-512.png",
-      "type": "image/png",
-      "sizes": "512x512"
-    },
-    {
-      "src": "{{StaticUrlPrefix}}/img/logo-192.png",
-      "type": "image/png",
-      "sizes": "192x192"
-    }
-  ],
-  "start_url": "{{AppSubUrl}}/",
-  "scope": "{{AppSubUrl}}/",
-  "background_color": "#FAFAFA",
-  "display": "standalone",
-  "theme_color": "{{ThemeColorMetaTag}}"
-}