Tab-session-manager: Import of .json Session file is not working

[olaims]

Short description

I exported the session into a .json file before formating my PC. Now, after a clean Windows 10 install I tried to import that .json file, but no Tabs are restored. The .json file contains all information of the around 50 Tabs (I opened it with Notepad++ to check the content)

Steps to reproduce

1. Start browser with clean profile
2. Install Tab Session Manager
3. Import session (select file)
4. Import session (click on "import" button)

Expected result

Tabs should be imported

Actual result

Nothing happens

Platform information

Windows 10
Firefox Developer 67.0b14
Version of Tab Session Manager: Version 4.5.2

Additional context

[sienori]

The imported sessions are displayed in the toolbar popup.

[mirh]

It doesn't work for me either.
I import the .json backup I made, "1 session" is detected and I get the nice and dandy "Sessions imported." popup.
None appears anywhere.
EDIT: I followed instructions here, here and here, with just this

[debug] background/import: import() 
Array [ {…} ]
background.js:1:67100
[debug] background/sessions: search() date 1564158686849 background.js:1:67100
[debug] background/sessions: =>search() 
Array []
background.js:1:67100
[debug] background/save: saveSession() 
Object { windows: {…}, windowsNumber: 1, windowsInfo: {…}, tabsNumber: 131, name: "Tab Session Manager", date: 1564158686849, tag: (1) […], sessionStartTime: 1564158657419, id: "7d5ade25-376d-482a-bc52-775bbd4042ee" }
 true background.js:1:67100
[debug] background/sessions: put() 
Object { windows: {…}, windowsNumber: 1, windowsInfo: {…}, tabsNumber: 131, name: "Tab Session Manager", date: 1564158686849, tag: (1) […], sessionStartTime: 1564158657419, id: "7d5ade25-376d-482a-bc52-775bbd4042ee" }
background.js:1:67100
[debug] background/sessions: =>put() success

[uberkael]

I can confirm it also in Chrome 77.0.3865.75. and Firefox 69.0

After accepting the popup the console shows:

options.js:1 Uncaught (in promise) TypeError: Error in invocation of runtime.sendMessage(optional string extensionId, any message, optional object options, optional function responseCallback): Message length exceeded maximum allowed length.
at options.js:1
at new Promise ()
at c (options.js:1)
at Object.apply (options.js:1)
at ImportSessionsComponent.importSessions (options.js:22)
at Object. (options.js:22)
at Object.invokeGuardedCallback (options.js:22)
at Object.invokeGuardedCallbackAndCatchFirstError (options.js:22)
at x (options.js:22)
at H (options.js:22)

[kamidev]

I have a similar problem after a browser crash. The crash came directly after updating to FIrefox Developer 70.0b8, on MacOS.

I have session backups in JSON format. But when I try to import them in a new profile, I get this:

If I try to import anyway, I get a message saying "Session imported". But nothing is imported.

[kamidev]

I have nine months worth of backups but none of my old files seem to work. But if I create a new session in my fresh FIrefox profile, I can export it and import it back without problems.

With debugging turned on, I get error messages "Error processing windowTypes: This property is deprecated" when failing to read a JSON file.

https://user-images.githubusercontent.com/1655/65346272-a17b2100-dbdc-11e9-9683-0c87b8ae5dec.png

[kamidev]

Since I had a fresh backup of my profile, I finally get my sessions back using @sienori:s helpful instructions here: https://github.com/sienori/Tab-Session-Manager/wiki/IndexedDB-Error.

[sienori]

I confirmed the problem where importing huge sessions failed. https://github.com/sienori/Tab-Session-Manager/issues/461
I fixed it in version 5.1.1. Thanks!