Hi all (and especially Mario),

System in use:
Linux Mint 19.2
Firefox 68.01 & Firefox dev 69.0b10
TWc 2.8.1

I am a very satisfied user of Mario's File Backups; I use it for a lot of 
TW5 wikis. I use it for a few TWc wikis as well and there started a problem 
a few days ago. I saved a (big and heavily modified) TWc wiki. After 
refreshing the browser tab I got the following error message:

[image: File-backups.png]


After clicking OK the TWc wiki did not load anymore. Comparing the wikis 
before and after saving showed differences at 15 places (only the first and 
last change important); see the P.S.

Thereafter I did some tests with a Minimal Test Case (empty TWc 2.8.1; 
closing/restarting FF in between tests)

Test 1: standard FF (all add-ons enabled) => error message after 
saving/refreshing but wiki reloads normally
Test 2: standard FF (all add-ons disabled except File Backups) => error 
message after saving/refreshing but wiki reloads normally
Test 3: standard FF (reinstalled FB, other add-ons disabled) => error 
message after saving/refreshing but wiki reloads normally
Test 4: FF dev (all add-ons disabled except File Backups) => error message 
after saving/refreshing but wiki reloads normally
Test 5: empty 2.9.2 standard FF (all add-ons disabled except File Backups) 
=> error message after saving/refreshing but wiki reloads normally

Comparing the TWc wikis before and after saving showes differences at 3 
places:

*empty 281 before save:*

<!--PRE-HEAD-END-->
<title>

</title>

...

<div id="storeArea"></div>

...

<!--POST-SCRIPT-END-->
</body>
</html>


*empty281 after save:*

<!--PRE-HEAD-END-->
<title> My TiddlyWiki - a reusable non-linear personal web notebook </title>

...

<div id="storeArea">

</div>

...


!--POST-SCRIPT-END-->


<div id="tiddlyfox-message-box" style="display: none;" 
data-message-box-creator="file-backups"></div></body></html>


The same differences can be seen with TWc 2.9.2.

What strikes me most is the fact that it does not happen with Windows 10 
and FF 68.01! Even the heavily modified TWc saves/reloads without 
message/problems!

File Backups works perfectly with TW5!

Questions:

1) Is it possible that FF 68.01 behaves different under Windows 10 then 
under Linux Mint?
2) Can someboy confirm my findings with Linux Mint (Ubuntu/Debian) & FF?

Thanks in advance,

Ton

P.S. In the heavily modified TWc 15 changes were found after saving:

1) Some code had been deleted after the head section:


<body onload="main();" onunload="if(window.unload) unload();">

2) ..14) Unimportantant changes (order of items; mainly plugin headings)
15) The added div at the end:


<div id="tiddlyfox-message-box" style="display: none;" 
data-message-box-creator="file-backups"></div>

Removing the div and adding the deleted code (in a text editor) created a 
working TWc again.






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