Basically, I suspect Firefox to overwrite my preset value in an input. It happens when pressing F5 on a page where there is an input of which the preset value has been changed. The previous value is being displayed on screen. If I go into url bar and press enter, the correct (fresh) value appears.
This is the piece of my (django) template:
{{ reply_recipients_id_list }}
<input class="text" type="text" value="{{ reply_recipients_id_list }}" placeholder="Recipients" name="recipients" id="id_recipients">
This is renderred html:
1,33
<input id="id_recipients" class="text" type="text" name="recipients" placeholder="Recipients" value="1,33">
However, there is different value displayed as you can see in the picture:
(!) Javascript is switched off for the page (!)