Changelog
For Beta version changelog, please see Beta Changelog
⚠️ Please note that if you are using Windows 8/7/XP, or your browser kernel version is lower than 120, you need to manually install the legacy version of ScriptCat. v0.16.x is the last version that supports Manifest V2. Installation steps can be found at: Install Extension by Loading Unpacked.
1.4.0 (2026-06-26)
This release brings low-level refactoring in preparation for Firefox MV3, along with editor experience improvements (edit menu, Ctrl+Shift+F formatting, Monaco quick fix), multi-platform search engine selection for script discovery, new capabilities such as @unwrap / window.onurlchange / @run-at context-menu, comprehensive hardening of cloud storage sync reliability, and a large batch of GM API, UI, and stability fixes (including a long-running memory leak and prototype pollution security vulnerabilities). The ScriptCat AI Agent is available as a preview in dev / Beta builds and is not yet enabled in the stable release.
🚀 Major New Features
- 🧪 ScriptCat AI Agent (Preview — available in dev / Beta builds only, not yet enabled in stable) — AI-powered agent system with conversational interaction, tool calling, Skill system, MCP protocol, and more (#1324) (by @CodFrm)
- ✨ Support the
@unwrapmetadata tag (#1213) (by @cyfung1031) - ✨ Implement TM's
window.onurlchangevia the Navigation API (#1315) (by @cyfung1031) - ✨ Restore
@run-at context-menusupport (#1442) (by @cyfung1031) - ✨ Script discovery supports multi-platform search engine selection (#1295) (by @CodFrm)
- ✨ Add more icon service providers (#1333) (by @cyfung1031)
- ✨ Add an update-check icon to the "last updated" column in the script list (#1304) (by @CodFrm)
- ✨ Improve edit-conflict and script-name-conflict handling (#1223) (by @cyfung1031)
🧑💻 Editor
- ✨ Add an edit menu to the editor (find, replace, undo, etc.) (#1303) (by @CodFrm)
- ✨ Editor supports Ctrl+Shift+F formatting (#1415) (by @cyfung1031)
- ✨ Improve Monaco quick fix and user-script metadata hints (#1461) (by @cyfung1031)
- 🐛 Fix Ctrl-F / Ctrl-H shortcuts (#1312) (by @cyfung1031)
- 🐛 Fix ESLint fix feature not working #1079 (#1184) (by @cyfung1031)
- 🐛 Fix editor CSS layout issues (#1460) (by @cyfung1031)
- 🐛 Fix ScriptEditor script list display in light theme (#1288) (by @CodFrm)
- 🐛 Fix and improve ScriptEditor issues (#1258) (by @cyfung1031)
⚡️ Performance Improvements
- 🚑 Fix a potential memory leak during long-running ScriptCat sessions (#1401) (by @cyfung1031)
- ⚡️ Remove Baidu filesystem dependency on global DNR rules, switch to per-request cookie disabling (#1377) (by @cyfung1031)
- ⚡️ Optimize multi-platform search engine selection for script discovery (#1379) (by @cyfung1031)
- ⚡️ Use a monospace font for the install page loadingStatus to avoid jitter (#1381) (by @cyfung1031)
- ⚡️ Optimize pushValue handling (#1403) (by @cyfung1031)
- ⚡️ More complete permission checks and better userScript permission hints (#1251) (by @cyfung1031)
- ⚡️ Improve MessageConnect memory management and cleanup mechanism (#1248) (by @cyfung1031)
🐛 Bug Fixes
- 🐛 Harden cloud storage sync reliability (Dropbox / WebDAV / Google Drive / OneDrive authentication, path handling, and retry logic) (#1374 ~ #1395) (by @cyfung1031)
- 🐛 Fix multiple cloud sync issues: OneDrive zero-byte upload, Google Drive / OneDrive error normalization, S3 custom metadata modifiedDate (#1405) (#1406) (#1408) (by @cyfung1031)
- 🐛 Remove the WebDAV verify write-probe to avoid false negatives on services with a non-writable root (e.g. Nutstore) (#1445) (by @CodFrm)
- 🐛 Fix cross-origin request failure when site access permission is missing (#1477) (by @cyfung1031)
- 🐛 Fix Edge Android mobile popup adaptation #686 (#1507) (by @CodFrm)
- 🐛 Fix white background flash during initial load #1497 (#1498) (by @cyfung1031)
- 🐛 Fix message connections (GM API / ports) not being cleaned up properly (#1474) (by @cyfung1031)
- 🐛 Fix
@matchtemplate mismatch when search is missing (#1466) (by @cyfung1031) - 🐛 Add
protoBaseDescsto fix ancestor-class inheritance in the Tampermonkey semi-sandbox (#1463) (by @cyfung1031) - 🐛 Fix missing null handling for
GM_xmlhttpRequestmsgConn (#1433) (by @cyfung1031) - 🐛 Fix GM xhr not handling abnormal onloadend correctly (#1412) (by @cyfung1031)
- 🐛 Fix ScriptEditor list dynamic update and display issues (#1414) (by @cyfung1031)
- 🐛 Fix session rule count issue with concurrent xhr (#1353) (by @cyfung1031)
- 🐛 Fix entire page crash caused by an invalid cron expression (#1327) (by @cyfung1031)
- 🐛 Fix all scripts failing when a single script times out during batch update check (#1265) (by @cyfung1031)
- 🐛 Add extensionEnv handling for isIncognito, userAgent, and run-in (#1368) (by @cyfung1031)
- 🐛 Fix onboarding guide button being partially hidden #1396 (#1398) (by @cyfung1031)
- 🐛 Fix tooltip being obscured on the script management page #1386 (#1387) (by @Xdy1579883916)
- 🐛 Fix Sidebar causing abnormal resizing in card mode #1179 (#1373) (by @cyfung1031)
- 🐛 Fix incorrect origin set when installing local files via drag-and-drop (#1371) (by @cyfung1031)
- 🐛 Fix language switching prompt message (#1380) (by @cyfung1031)
- 🐛 Improve log display UI (#1372) (by @cyfung1031)
- 🐛 Fix UserConfigPanel CSS (#1361) (by @cyfung1031)
- 🐛 Use
Object.create(null)for the empty object in create_context (#1397) (by @cyfung1031) - 🐛 Fix silent update and connect permission logic for subscribed scripts (#1201) (by @cyfung1031)
- 🐛 Fix log page query button not refreshing the time (#1294) (by @CodFrm)
