I’ve been experiencing an issue where dragging a URL or text from Notepad++ into Firefox causes the text to be removed from Notepad++. It behaves like Firefox is requesti… (kàsi)
I’ve been experiencing an issue where dragging a URL or text from Notepad++ into Firefox causes the text to be removed from Notepad++. It behaves like Firefox is requesting a MOVE operation instead of a COPY. This only happens with Firefox, dragging the same text into Vivaldi, Chrome, Edge, etc. does not delete the text.
Here’s everything I’ve already tried:
1. Verified it’s not a Notepad++ setting
Disabled “Multi‑Editing” in Notepad++
Restarted Notepad++
Confirmed the issue only happens with Firefox, not other browsers
2. Tested Firefox Safe/Troubleshoot Mode
Launched Firefox in Troubleshoot Mode (no extensions, no themes, default settings)
The issue still happens there, so it’s not caused by an extension or add‑on
3. Created a brand‑new Firefox profile
Went to about:profiles
Created a completely new, clean profile with no imported data
Tested dragging again — the issue still happens even in a fresh profile
4. Reset and recreated drag‑related Firefox preferences
I checked and/or reset the following in about:config:
ui.dragThresholdX → recreated as Integer = 16
ui.dragThresholdY → recreated as Integer = 16
dom.event.clipboardevents.enabled → set to false
browser.drag_out_of_frame_style → set to 0
browser.search.context.loadInBackground → false
browser.tabs.searchclipboardfor.middleclick → false
browser.urlbar.update1 → false
widget.disable-native-drag → true
Restarted Firefox after each change.
None of these resolved the issue.
5. Tested modifier‑key behavior
Holding CTRL while dragging does prevent the text from being deleted
→ This confirms Firefox is treating normal drags as MOVE instead of COPY.
6. Verified it’s Firefox‑only
Dragging the same text from Notepad++ into Vivaldi, Chrome, Edge, Word, Notepad, etc. works normally
Only Firefox causes the source text to be removed
I'm at a loss of what the issue can be or where to go from here or if there is no fix at the moment.