[Help Request] Need Help Restoring/Opening Tampermonkey Scripts

[llaurens-tech]

Sorry if this is the wrong venue, but I'm trying to recover corrupted(?) Firefox Tampermonkey files and I don't know where else to ask.

My PC crashed with a blue screen, and when I re-launched Firefox, Tampermonkey does not work at all. Clicking the TM icon in the toolbar just shows a tiny grey window with an infinite spinner. There's no way to access the dashboard or anything, all I can do is disable or enable the extension. If I try to load any webpage where TM would be allowed to work (basically anything outside of mozilla.org), it takes exactly 40.96s (every time, on the dot) to load the page. Disabling TM fixes that.

In the extension inspection console, I get the following log when I enable TM:

alarm: init done 
Object {  }
 
Object {  }
background.js:607:177
Storage: use storage.local background.js:297:17
Uncaught TypeError: can't convert undefined to object
    list moz-extension://e3437203-9ae7-4b24-87ff-e692c539392e/background.js:284
background.js:284:328
    list moz-extension://e3437203-9ae7-4b24-87ff-e692c539392e/background.js:284
    apply self-hosted:2253
    applySafeWithoutClone resource://gre/modules/ExtensionCommon.sys.mjs:691
    applySafeWithoutClone resource://gre/modules/ExtensionCommon.sys.mjs:690
    wrapPromise resource://gre/modules/ExtensionCommon.sys.mjs:914
    withLastError resource://gre/modules/ExtensionCommon.sys.mjs:833
    wrapPromise resource://gre/modules/ExtensionCommon.sys.mjs:902

If I navigate to "...(Profile)\storage\default\moz-extension+++e3437203-9ae7-4b24-87ff-e692c539392e^userContextId=4294967295\idb" and delete the "3647222921wleabcEoxlt-eengsairo.sqlite" file (the Tampermonkey local storage file, right?), then TM creates a new blank file and everything works again, but all of my scripts and settings are gone.

So, presumably, a TM script was probably writing something to a file and it got corrupted when I BSODed. Is there any way to retrieve and restore whatever non-corrupted data is still in there? I tried opening the sqlite file with DB Browser but I've never worked with SQLite before so I had no idea what I was looking at.

Environment

• Browser and Version: Firefox 146.0.1
• Tampermonkey version: 5.4.1
• Operating System and Version: Windows 10

[derjanb]

#2592 is the only starting point I can share for now

[derjanb]

Do you see storage data at the extension page debugger?
Maybe some storage keys are there and Tampermonkey is throwing an error at the first corrupted only.

https://stackoverflow.com/questions/67763573/firefox-extension-how-to-get-extension-storage-value

[llaurens-tech]

When I click the Storage tab of the extension debugger, nothing happens. All the other tabs work, but clicking the Storage tab just continues displaying the content of whatever previous tab I was viewing.

That other issue is what originally gave me the idea to delete the .sqlite file to see if that fixed TM (it did). I still have the '3647222921wleabcEoxlt-eengsairo.files' folder with its contents, and a session backup from before the BSOD. I was able to restore that session backup but it didn't change anything, TM was still broken. I wasn't sure where to go from there, so I decided to post my own issue.

[davidzou2131]

My IDB was corrupted when I created a new script that got picked up as malware by Windows Defender.
It had quarantined (removed) the associated blob file in the xxx-eengsairo.files folder.
You are likely able to fix the error by restoring the file and allow-listing it, though it may get picked up again in future. Consider modifying the script until it no longer gets picked up as a threat.

Assuming you still have the IndexedDB database sqlite, the contents can be read and recovered.
You'll need Python3 and this python module: https://gitlab.com/ntninja/moz-idb-edit

Use the script below to extract the scripts that lived in the sqlite file as BLOBs.
Run the script with the sqlite database file as the first argument.
New js files will be created in the working directory, named as its unique ID.

If you don't want to install the package, just download the module source and edit __init__.py.
Replace the __version__ = xxx with __version__ = 0.
Then place the the mozidbedit folder next to the script file below.

import json
import re
import sys
from mozidbedit import mozidb

idb = mozidb.IndexedDB(sys.argv[1])

for k in [x for x in idb.list_objects() if x.startswith("!extdb.@uid#")]:
    uid = re.match(r".+#([0-9a-f-]{36})", k).group(1)
    name = idb.read_object("!extdb.@uid#" + uid)["value"]
    source = idb.read_object("!extdb.@source#" + uid)["value"]
    
    print(f"{uid}:{name}")

    with open(uid + ".js", "w", encoding="utf-8") as f:
        f.write(source)

idb.close()