1479005 - Add new rule button on a website with CSP throws an error

Status: RESOLVED DUPLICATE of bug 1476439

(DevTools :: Inspector, defect)

Description

[Greg Tatum [:gregtatum]]

This happens 63, 62, and 61, and is specific to certain webpages. I wonder if it's CSP related?

STR:
 * Go to https://monitor.firefox.com/ or https://send.firefox.com/
 * Open inspector on a page and target a node.
 * Click the + button to add a new rule

ER:
 * It creates a new rule in the pane.

AR:
 * A stylesheet node is added to the bottom of the page, but no rule is added.
 * The following error is thrown:

Error while calling actor 'pagestyle's method 'addNewRule' sheet is null protocol.js:1016:5
writeError
resource://devtools/shared/protocol.js:1016:5
handler/</<
resource://devtools/shared/protocol.js:1206:25
(Async: promise callback) handler/<
resource://devtools/shared/protocol.js:1203:18
_queueResponse
resource://devtools/shared/protocol.js:1030:22
handler
resource://devtools/shared/protocol.js:1202:9
onPacket
resource://devtools/server/main.js:1654:15
receiveMessage
resource://devtools/shared/transport/child-transport.js:66:5
(Async: MessageListener.receiveMessage) _addListener
resource://devtools/shared/transport/child-transport.js:40:5
ready
resource://devtools/shared/transport/child-transport.js:57:5
_onConnection
resource://devtools/server/main.js:1090:5
connectToParent
resource://devtools/server/main.js:572:12
onConnect</<
resource://devtools/server/startup/frame.js:50:22
onConnect<
resource://devtools/server/startup/frame.js:49:7
exports.makeInfallible/<
resource://devtools/shared/ThreadSafeDevToolsUtils.js:109:14
(Async: MessageListener.receiveMessage) <anonymous>
resource://devtools/server/startup/frame.js:72:5
<anonymous>
resource://devtools/server/startup/frame.js:19:4
10:10:23.050 addNewRule@resource://devtools/shared/base-loader.js -> resource://devtools/server/actors/styles.js:931:11
async*handler@resource://devtools/shared/base-loader.js -> resource://devtools/shared/protocol.js:1173:21
onPacket@resource://devtools/shared/base-loader.js -> resource://devtools/server/main.js:1654:15
receiveMessage@resource://devtools/shared/base-loader.js -> resource://devtools/shared/transport/child-transport.js:66:5
MessageListener.receiveMessage*_addListener@resource://devtools/shared/base-loader.js -> resource://devtools/shared/transport/child-transport.js:40:5
ready@resource://devtools/shared/base-loader.js -> resource://devtools/shared/transport/child-transport.js:57:5
_onConnection@resource://devtools/shared/base-loader.js -> resource://devtools/server/main.js:1090:5
connectToParent@resource://devtools/shared/base-loader.js -> resource://devtools/server/main.js:572:12
onConnect</<@resource://devtools/server/startup/frame.js:50:22
onConnect<@resource://devtools/server/startup/frame.js:49:7
exports.makeInfallible/<@resource://devtools/shared/base-loader.js -> resource://devtools/shared/ThreadSafeDevToolsUtils.js:109:14
MessageListener.receiveMessage*@resource://devtools/server/startup/frame.js:72:5
@resource://devtools/server/startup/frame.js:19:4
protocol.js:1019:7
writeError
resource://devtools/shared/protocol.js:1019:7
handler/</<
resource://devtools/shared/protocol.js:1206:25
(Async: promise callback) handler/<
resource://devtools/shared/protocol.js:1203:18
_queueResponse
resource://devtools/shared/protocol.js:1030:22
handler
resource://devtools/shared/protocol.js:1202:9
onPacket
resource://devtools/server/main.js:1654:15
receiveMessage
resource://devtools/shared/transport/child-transport.js:66:5
(Async: MessageListener.receiveMessage) _addListener
resource://devtools/shared/transport/child-transport.js:40:5
ready
resource://devtools/shared/transport/child-transport.js:57:5
_onConnection
resource://devtools/server/main.js:1090:5
connectToParent
resource://devtools/server/main.js:572:12
onConnect</<
resource://devtools/server/startup/frame.js:50:22
onConnect<
resource://devtools/server/startup/frame.js:49:7
exports.makeInfallible/<
resource://devtools/shared/ThreadSafeDevToolsUtils.js:109:14
(Async: MessageListener.receiveMessage) <anonymous>
resource://devtools/server/startup/frame.js:72:5
<anonymous>
resource://devtools/server/startup/frame.js:19:4

Comment 1

[Julian Descottes [:jdescottes]]

This is linked to the CSP on these websites, see the console:

`Content Security Policy: The page’s settings blocked the loading of a resource at inline (“style-src”).`

Comment 2

[Julian Descottes [:jdescottes]]

Already logged at 1476439