I installed official KeePassXC-Browser from https://chrome.google.com/webstore/detail/keepassxc-browser/oboonakemofpalcgghocfoadofidjkkk

Current Behavior

KeePassXC 2.3.0 with KeePassXC browser integration checked. When trying to connect to KeePassXC-Browser, it triggers the KeePassXC window and that's all. The extension shows "Timeout or not connected to KeePassXC". KeePassHTTP is working correctly like previously.

Debug Info

KeePassXC - Version 2.3.0 Revision: 4c0ed74

Libraries:

• Qt 5.9.3
• libgcrypt 1.8.2

Operating system: macOS High Sierra (10.13) CPU architecture: x86_64 Kernel: darwin 17.4.0

Enabled extensions:

• Auto-Type
• Browser Integration
• Legacy Browser Integration (KeePassHTTP)
• SSH Agent
• YubiKey

Connecting to native messaging host org.keepassxc.keepassxc_browser
_generated_background_page.html:1 Error in event handler: TypeError: Cannot read property 'stack' of undefined
    at Object.keepass.updatePopup (chrome-extension://oboonakemofpalcgghocfoadofidjkkk/background/keepass.js:1168:51)
    at onDisconnected (chrome-extension://oboonakemofpalcgghocfoadofidjkkk/background/keepass.js:967:13)
_generated_background_page.html:1 Unchecked runtime.lastError: Specified native messaging host not found.
browser-polyfill.min.js:1 Returning a Promise is the preferred way to send a reply from an onMessage/onMessageExternal listener, as the sendResponse will be removed from the specs (See https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/runtime/onMessage) Error
    at B (chrome-extension://oboonakemofpalcgghocfoadofidjkkk/browser-polyfill.min.js:1:8152)
    at Object.kpxcEvent.onUpdateAvailableKeePassXC (chrome-extension://oboonakemofpalcgghocfoadofidjkkk/background/event.js:206:5)
    at chrome-extension://oboonakemofpalcgghocfoadofidjkkk/background/event.js:72:21
B @ browser-polyfill.min.js:1
kpxcEvent.onUpdateAvailableKeePassXC @ event.js:206
(anonymous) @ event.js:72
Promise.then (async)
kpxcEvent.invoke @ event.js:46
kpxcEvent.onMessage @ event.js:13
(anonymous) @ browser-polyfill.min.js:1
keepass.js:1078 Error 5: Cannot connect to KeePassXC. Check that browser integration is enabled in KeePassXC settings.
keepass.js:993 Connecting to native messaging host org.keepassxc.keepassxc_browser
keepass.js:969 Failed to connect: Specified native messaging host not found.
keepass.js:1192 {}message: (...)get message: ƒ ()__proto__: Object
keepass.js:1078 Error 9: Key exchange was not successful.

I get this in Chrome's console. It works fine in firefox for me. KeepassXC 2.4.3